Nomenclature of Organic Compounds Question And Answers – NEET General Organic Chemistry

Nomenclature Of Organic Compounds

Question 1. The IUPAC name of the compound (CH₃)₂CH-CH=CH-CHOH-CH₃ is

1. 5-methyl-hex-3-en-2-ol
2. 2-methyl-hex-3-en-5-ol
3. 2-hydroxy-5-nethyl-3-hexene
4. 5-hydroxy-2-methyl-3-hexene

Answer: 1. 5-methyl-hex-3-en-2-ol

Solution: Follow IUPAC rules.

The IUPAC name of the compound (CH₃)₂CH-CH=CH-CHOH-CH₃ is 5-methyl-hex-3-en-2-ol

Read And Learn More: NEET General Organic Chemistry Notes, Question And Answers

Question 2. Which of the following represents the condensed formula for pentanes?

1. CH₃(CH₂)₃CH₃
2. (CH₃)₃CCH₃
3. (CH₃)₂CHCH₂ CH₃
4. All of these

Answer: 4. All of these

Solution: In condensed structural formula, parenthesis is used for the identical groups of atoms.

Question 3. Which is the most stable carbocation?

1. isopropyl cation
2. Triphenylmethyl cation
3. Ethyl cation
4. n-propyl cation

Answer: 2. Triphenylmethyl cation

Solution: Aryl carbonium ions are more stable than the alkyl carbonium ions. The order of stability of carbocation is

Triphenyl methyl >Diphenyl methyl> Benzyl>Allyl>30>2°>1°> methyl carbocation.

Question 4. Which of the following is phenyl ethanoate?

Answer: 3

Solution: Esters are named by prefixing the name of the alkyl or aryl group (of OR’ part) before the name of the parent acid and changing the suffix “ic” acid to ate. Hence, the structure of phenyl ethanoate is

Question 5. IUPAC name of CH₂=CH—CH(CH₃)₂ is:

1. 1,1-dimethyl-2-propene
2. 3-methyl-1-butene
3. 2-vinyl propane
4. 1-isopropyl ethylene

Answer: 2. 3-methyl-1-butene

Solution: Follow IUPAC rules.

Question 6. In the structure, the number of carbon atoms are:

1. One primary, two secondary and one tertiary
2. Four primary, two tertiary and one secondary
3. One primary, one secondary, one tertiary and one quaternary
4. Five primary, one secondary, one tertiary and one quaternary

Answer: 4. Five primary, one secondary, one tertiary and one quaternary

Solution: A primary carbon is one which is joined to one carbon atom. A secondary carbon atom is joined to two carbon atoms and the tertiary carbon is attached to three carbon atoms. A quaternary carbon has all its four valencies attached to carbon atoms.

Question 7. IUPAC name of the following compound is

1. 3, 5-dimethylcyclohexene
2. 3, 5-dimethyl-1-cyclohexene
3. 1, 5-dimethyl-5-cyclohexene
4. 1, 3-dimethyl-5-cyclohexene

Answer: 1. 3, 5-methylcyclohexane

Solution: Its IUPAC name is 3,5-dimethylcyclohexene.

Question 8. IUPAC name ofis

1. N, N- dimethylethanolamine
2. N-methyl, N-ethylmethanamine
3. Dimethyl-ethylamine
4. None of the above

Answer: 1. N, N- dimethylethanolamine

Solution: Follow IUPAC rules.

Question 9. The IUPAC name of CH₃-CH=CH-C=CH is

1. Pent-3-en-1-yne
2. Pent-3-en-4-yne
3. Pent-2-en-4-yne
4. Pent-2-en-3-yne

Question 10.

1. 1-amino prop-2-enal
2. 3-amino prop-2-enal
3. 1-amino-2-formyl ethene
4. 3-amino-1-oxoprop-2-ene

Answer: 2. 3-amino prop-2-enal

Solution: Follow IUPAC rules.

Question 11. The IUPAC name of an unsymmetrical ether with the molecular formula of C₄H₁₀O is

1. Ethoxy propane
2. Methoxy ethane
3. Ethoxy ethane
4. Methoxy propane

Answer: 4. Methoxy propane

Solution: Only two unsymmetrical ethers are possible from the formula C₄H₁₀O viz

CH₃ CH₂ CH₃-O-CH₃

Question 12. IUPAC name of urea is:

1. Diamino ketone
2. 1-aminoethanamide
3. 1-aminomethanamide
4. amino acetamide

Question 13. IUPAC name of C₆ H₅ CN is:

1. Phenyl nitrile
2. Benzene nitrile
3. Benzyl nitrile
4. Phenyl cyanide

Answer: 2. Benzene nitrile

Solution: Follow IUPAC rules.

Question 14. The IUPAC name of the compound is

1. 2(carboxymethyl)-pentane-1,5-dioic acid
2. 3-carboxy hexane-1, 6-dioic acid
3. Butane-1, 2, 4-tricarboxylic acid
4. 4-carboxy hexane-1, 6-dioic acid

Answer: 2. 3-carboxy hexane-1, 6-dioic acid

Solution: IUPAC name of the above compound is 3-carboxyhexane-1, 6-dioic acid.

Question 15. IUPAC name of

1. Dimethyl amine
2. 2-amino propane
3. Isopropyl amine
4. 2-propanamide

Answer: 4. 2-propanamide

Solution: 2-propanamide

Question 16. The IUPAC name of

1. 1, 1-dimethyl-1, 3-butanediol
2. 2-methyl-2, 4-pentanediol
3. 4-methyl-2, 4-pentanediol
4. l, 3, 3-trimethyl-1, 3-propanediol

Answer: 2. 2-methyl-2, 4-pentanediol

Solution: Follow IUPAC rules.

Question 17. The IUPAC name of the compound is

1. 2,4-dimethylhexanone-3
2. 2,6-dimethylheptanone-4
3. 2,6-dimethylhexanone-4
4. 2,6-dimethylheptanone-5

Answer: 2. 2,6-dimethylheptanone-4

Solution: Follow IUPAC rules.

Question 18. Lactic acid is:

1. Propionic acid
2. ^-hydroxy propanoic acid
3. a-hydroxy propanoic acid
4. None of the above

Answer: 3. a-hydroxy propanoic acid

Solution: Lactic acid is also called as a-hydroxy propionic acid or 2-hydroxy propanoic acid.

Question 19. The compound which contains all the four 1°, 2°, 3° and 4° carbon atoms is

1. 2, 3-dimethyl pentane
2. 3-chloro-2, 3-dimethyl pentane
3. 2, 3, 4-trimethylpentane
4. 3, 3-dimethyl pentane

Answer: 2. 3-chloro-2, 3-dimethyl pentane

Solution: 3-chloro-2, 3-dimethyl pentane contains all the four 1°,2°, 3° and 4° carbon atoms.

Question 20. The name formic acid was given for HCOOH because it was prepared from:

1. Acetum
2. Ant
3. Wood
4. Oxalis plant

Answer: 2. Ant

Solution: Formic acid was obtained from ant (Formica in Greek). This is the trivial name for HCOOH.

Question 21. The IUPAC name of the compound having the formula CH= C — CH=CH₂ is:

1. 1-butene-3-yne
2. 3-butene-1-yne
3. 1-butyn-3-ene
4. But-1-yne-3-ene

Answer: 1. 1-butene-3-yne

Solution: Follow IUPAC nomenclature.

Question 22. The IUPAC name of the below compound is

1. 1- cyclohexane-2,4-dienylethanone
2. 3- cyclohexane-2,4-dienylethanone
3. 1- cyclohexane-3,5-dienylethanone
4. 3- cyclohexane-3,5-dienylethanone

Answer: 1. 1- cyclohexane-2,4-dienylethanone

Solution: Follow IUPAC nomenclature.

Question 23. The IUPAC name of the below compound is

1. 1-methyl-1-amino propane
2. 2-amino butane
3. 2-methyl-3-amino propane
4. None of the above

Answer: 2. 2-amino butane

Solution: Follow IUPAC rules.

Question 24. The correct IUPAC name of (C₂ H₅)₄ C is:

1. Tetraethyl methane
2. 2-ethyl pentane
3. 3,3-diethyl pentane
4. None of these

Answer: 3. 3,3-diethyl pentane

Solution: Follow IUPAC rules.

Question 25. Which IUPAC name is wrong?

Answer: 3

Solution: It is 3-methyl butan-2-ol.

Question 26. The structural formula of 2,2,3-trimethyl hexane is:

Answer: 3

Solution: Follow IUPAC rules.

Question 27. IUPAC name of acraldehyde is

1. But-3-en-1-al
2. Propenyl aldehyde
3. But-2-ene-1-al
4. Prop-2-en-1-al

Answer: 4. Prop-2-en-1-al

Solution: IUPAC name of acraldehyde

Question 28. The IUPAC name of the compound is

1. 2-chloro-4-methyl-2-pentene
2. 4-chloro-2-methyl-3-pentene
3. 4-methyl-2-chloro-2-pentene
4. 2-chloro-4, 4-dimethyl-2-butene

Answer: 1. 2-chloro-4-methyl-2-penton

Solution: Follow IUPAC rules.

Question 29. 2-methyl pent-3-ene is achiral because it has:

1. A centre of symmetry
2. A plane of symmetry
3. Symmetry at C₂ carbon
4. Both centre and a plane of symmetry

Answer: 4. Both centre and a plane of symmetry

Solution: If the structure of the compound is drawn then we find that a plane of symmetry is present in this compound. The two halves are equal hence the compound does not have a chiral point, in addition to this it has a Centre. The two sides of the compound on the different sides of the centre atom are similar. Both the reasons are present which signifies that the molecule is achiral.

Question 30. The IUPAC name of the compound is

1. 3,4-dimethyl-3-n-propyl nonane
2. 4-ethyl-4,5-dimethyl decane
3. 6,7-dimethyl-7-n-propyl nonane
4. 6,7-dimethyl-7-ethylene

Answer: 2. 4-ethyl-4,5-dimethyl decane

Solution: Follow IUPAC rules.

Question 31. Give the correct IUPAC name for

1. 2-ethoxy-5-chloroethane
2. l-chloro-4-ethoxy-4-methyl butane
3. 1-chloro-4-ethoxy pentane
4. Ethyl-1-chloropentylether

Answer: 1. 2-ethoxy-5-chloroethane

Solution: According to the IUPAC system, ether is named as alkoxy alkane. The larger alkyl group forms the parent chain while the lower alkyl group takes in ethereal oxygen and forms a part of the alkoxy group.

Question 32. The IUPAC name of the compound, CH₃ CH = CHC = CH is:

1. Pent-4-yn-2-ene
2. Pent-3-en-1-yne
3. Pent-2-en-4-yne
4. Pent-1-yn-3-ene

Answer: 2. Pent-3-en-1-yne

Solution: Follow IUPAC rules.

Question 33. The IUPAC name of C₆ H₅ COCl is

1. Benzoyl chloride
2. Benzene chloro ketone
3. Benzene carbonyl chloride
4. Chloro phenyl ketone

Answer: 1. Benzoyl chloride

Solution: Follow IUPAC rules.

Question 34. IUPAC name of the compound

1. 5- methyl-4-isopropyl-6, 6’diethyloctane
2. 3, 3-dimethyl, 3-ethyl-5- isopropyl octane
3. 3, 3-diethyl-4-methyl-5-(1,1-dimethyl) octane
4. 3, 3- diethyl-4-methyl-5-(1’-methylethyl) octane

Answer: 4. 3, 3- diethyl-4-methyl-5-(1’-methyl ethyl) octane

Solution: Select the longest possible carbon atom chain, number it and name the compound according to IUPAC rules.

Question 35. The IUPAC name of is

1. But-3-enoic acid
2. But-1-enoic acid
3. Pent-4-enoic acid
4. Prop-2-enoic acid

Question 36. The correct IUPAC name of the below molecule is

1. Isopropyl benzene
2. Cumene
3. Phenyl isopropanol
4. 2-phenyl propane

Answer: 4. 2-phenyl propane

Solution: Follow IUPAC rules.

Question 37. The IUPAC name of the compound is

1. 2-methyl pent-1-en-4-yne
2. 4-methyl pent-4-en-1-yne
3. 2-methyl pent-2-en-4-yne
4. 4-methyl pent-1-en-4-yne

Answer: 1. 2-methylpent-1-en-4-yne

Solution: Follow IUPAC rules.

Question 38. Freon-114 is an organic compound. k is chemically called 1,2dichlorotetrafluoroethane. Its correct structural formula is:

Answer: 3

Solution: Follow IUPAC rules.

Question 39. The IUPAC name of the following compound is

1. Propionic anhydride
2. Di propanoic anhydride
3. Ethoxy propanoic acid
4. Propanoic anhydride

Answer: 4. Propanoic anhydride

Solution: In the IUPAC system, anhydrides are named as alkanoic anhydride.

Question 40. IUPAC name of the compound is

1. 2-ethyl-3-methyl-hexa-l-en-4-yne
2. 5-ethyl-4-methyl-hexa-2-yn-5-ene
3. 3-methylene-4-methylhepta-5-yne
4. 5-methylene-5-ethyl-4-methylhepta-2-yne
5. Answer: 1. 2-ethyl-3-methyl-hexa-l-en-4-yne

Solution:-do-

Question 41. Bicyclo (1,1,0) butane is

Answer: 3

Its IUPAC name is bicyclo [1,1,0] butane.

Question 42. t-butyl alcohol is

1. 2-methyl propane-2-ol
2. 2-methyl propane-1-ol
3. 3-methyl butane-1-ol
4. 3-methyl butane-2-ol

Answer: 1. 2-methyl propan-2-ol

Solution: 2-methyl propan-2-ol is tert-butyl alcohol.

Question 43. IUPAC name of C₆ H₅ COCl is:

1. Benzal chloride
2. Benzenechloro ketone
3. Benzene carbonyl chloride
4. Chloro phenyl ketone

Answer: 3. Benzene carbonyl chloride

Solution: Follow IUPAC rules.

Question 44. The IUPAC name for tertiary butyl iodide is

1. 4-iodo butane
2. 2-iodo butane
3. 1-iodo-3-methyl propane
4. 2-iodo-2-methylpropane

Answer: 4. 2-iodo-2-methylpropane

Solution: Its IUPAC name is 2-iodo-2-methyl propane.

Question 45. The correct structure of dimethyl butane is:

1. CH₃CH₃—C=C—CH₂ CH₃
2. (CH₃)₃C —C —C≡CH
3. CH₃—C=CCH(CH₃)₂
4. 

Answer: 2. (CH₃)₃C —C —C≡CH

Question 46. Glyoxal is

1. CH₂OH-CH₂OH
2. CHO-CH₂OH
3. COOH-CO-COOH
4. CHO-CHO

Answer: 4. CHO-CHO

Solution:

Question 47. Give the IUPAC name for,

1. Ethyl-4- oxo heptanoate
2. Methyl-4- oxo heptanoate
3. Ethyl-4- oxo hexanoate
4. Methyl 4- oxo hexanoate

Answer: 4. Methyl 4- oxo hexanoate

Solution: Follow IUPAC rules.

Question 48. The IUPAC name of the compound,

1. 2-ethylbutanamide
2. 2-methylbutanamide
3. 1-amino-2-methylpropane
4. None of the above

Answer: 2. 2-methylbutanamide

Solution: Follow IUPAC rules.

Question 49. The IUPAC name of CH₃ COCH(CH₃)₂ is

1. Isopropyl methyl ketone
2. 2-methyl-3-butanone
3. 4-methyl isopropyl ketone
4. 3-methyl-2-butanone

Answer: 4. 3-methyl-2-butanone

Solution:

The keto functional group is given priority.

Question 50. The IUPAC name of the following compound is

1. Bicyclo [2,2,0] octane
2. Bicyclo [0,2,2] hexane
3. Bicyclo [2,1,1] hexane
4. Bicyclo [2,2,0] hexane

Answer: 4. Bicyclo [2,2,0] hexane

Solution: Hence, the correct IUPAC name is bicyclo [2,2,0] hexane.

Question 51. The IUPAC name of the compound,

1. 1,2-dimethyl-2-butenol
2. 3-methylpent-3-en-2-ol
3. 3,4-dimethyl-2-buten-4-ol
4. 2,3-dimethyl-3-pentenol

Answer: 2. 3-methyl pent-3-en-2-ol

Solution: Follow IUPAC rules.

Question 52. IUPAC name of (CH₃)₃ CCl is

1. n-butyl chloride
2. 3-chloro butane
3. 2-chloro 2-methyl propane
4. t-butyl chloride

Answer: 3. 2-chloro 2-methyl propane

Solution: Follow IUPAC rules.

Question 53. What is the correct IUPAC name of the compound?

1. 4-methoxy-2-nitrobenzaldehyde
2. 4-formyl-3-nitro anisole
3. 4-methoxy-6-nitrobenzaldehyde
4. 2-formyl-5-methoxy nitrobenzene

Answer: 1. 4-methoxy-2-nitrobenzaldehyde

Solution: Follow IUPAC rules.

Question 54. What is the correct IUPAC name of the compound?

1. 5-methyl hexanol
2. 2-methyl hexanol
3. 2-methylhex-3-enol
4. 4-methyl pent-2-enol

Answer: 4. 4-methyl pent-2-enol

Solution: —do—

Question 55. The IUPAC name of the compound is:

1. But-2-ene-2,3-diol
2. Pent-2-ene-2,3-diol
3. 2-methylbut-2-ene-2,3-diol
4. Hex-2-ene-2,3-diol

Answer: 2. Pent-2-ene-2,3-diol

Solution: Follow IUPAC rules.

Question 56. Which nomenclature in IUPAC is incorrect?

1. Pentyne-3
2. Pentyne-2
3. Hexyne-3
4. None of these

Answer: 1. Pentyne-3

Solution: CH₃ C = CCH₂ CH₃; It is always pentyne-2 and never pentyne-3.

Question 57. The IUPAC name of the compound CH₃ CONHBr is

1. 1-bromoacetate
2. Ethanoylbromide
3. N-Bromoethanamide
4. None of these

Answer: 3. N-Bromoethanamide

Solution: Follow IUPAC rules.

Question 58. The IUPAC name of the compound is:

1. 3-ethyl-4,4-dimethyl heptane
2. 1,1-diethyl-2,2-dimethyl pentane
3. 4,4-dimethyl-5,5-diethyl pentane
4. 5,5-diethyl-4, 4-dimethyl pentane

Answer: 1. 3-ethyl-4,4-dimethyl heptane

Solution: Follow IUPAC rules.

Question 59. The correct IUPAC name of the compound is:

1. 3-(1-ethyl propyl) hex-1-ene
2. 4-Ethyl-3-propyl hex-1-ene
3. 3-Ethyl-4-ethenyl heptane
4. 3-Ethyl-4-propyl hex-5-ene

Answer: 2. 4-Ethyl-3-propyl hex-1-ene

Solution: Follow IUPAC rules.

Question 60. The IUPAC name of the following compound is

1. 4-bromo-3-cynophenoal
2. 2-bromo-5-hydroxy benzonitrile
3. 2-cyano-4-hydroxybromobenzene
4. 6-bromo-3-hydroxy benzonitrile

Answer: 2. 2-bromo-5-hydroxy benzonitrile

Solution: The Cyano group has the highest priority therefore, parent name must be benzonitrile. Br occurs at 2- position, and hydroxyl at 3-position, hence the IUPAC name is 2-bromo-5-hydroxy benzonitrile.

Question 61. IUPAC name of the compound is

1. 2-chloromethyl-4-methyl-hexanal
2. 1-chloro-4-ethyl-2-pentanal
3. 1-chloro-4-methyl-2-hexanal
4. 1-chloro-2-aldo-4-methyl hexane

Answer: 1. 2-chloromethyl-4-methyl-hexanal

Solution: Follow IUPAC rules.

Question 62. Which one is not in the IUPAC system?

Answer: 2

Solution: It should be 4-ethyl-3-methyl heptane.

Question 63. The correct IUPAC name is

1. 1- cyclopropyl Cyclobutane
2. 1, 1-cyclobutane
3. 1- cyclobutane-1- cyclopropane
4. None of the above

Answer: 1. 1- cyclopropyl Cyclobutane

Solution: Follow IUPAC rules.

Question 64. The IUPAC name of the compound

1. 3, 3-dimethyl-1-hydroxy cyclohexane
2. 1, 1-dimethyl-3- hydroxy cyclohexane
3. 3, 3- dimethy-1- cyclohexanol
4. 1,1-dimethyl-3-cyclohexanol

Answer: 3. 3, 3- dimethyl-1- cyclohexanol

Solution: Carbon with – OH group is given C₁ thus it is 3, 3-dimethyl-1-cyclohexanol.

Question 65. The IUPAC name of the compound is

1. But-2-en-l-ol
2. l-hydroxy but-l-ene
3. 4-hydroxy butene-3
4. But-l-en-l-ol

Answer: 4. But-l-en-l-ol

Solution: Follow IUPAC rules.

Question 66. The name of (CH₃)₂ HC—O—CH₂—CH₂—CH₃ is:

1. Isopropyl propyl ether
2. Dipropyl ether
3. Di-isopropyl ether
4. Isopropyl propyl ketone

Answer: 1. Isopropyl propyl ether

Solution: Ether group (—O—) has propyl and isopropyl groups on its two sides.

Question 67. IUPAC name of, CH₃ CH(OH) CH₂ CH₂ COOH is:

1. 4-hydroxy pentanoic acid
2. 1-carboxy-3-butanoic acid
3. 1-carboxy-4-butanol
4. 4-carboxy-2-butanol

Answer: 1. 4-hydroxy pentanoic acid

Question 68. The prefix name of —SH group in IUPAC system is:

1. Mercapto
2. Thiol
3. Sulphide
4. None of these

Answer: 1. Mercapto

Solution: Follow IUPAC rules.

Question 69. The correct structure of 4-bromo-3-methyl-but-1-ene.

1. Br-CH=C(CH₃)₂
2. CH₂=CH-CH(CH₃)-CH₂ Br
3. CH₂=C(CH₃)CH₂ CH₂ Br
4. CH₃-C(CH₃)=CHCH₂-Br

Answer: 2. CH₂=CH-CH(CH₃)-CH₂ Br

Solution: Follow IUPAC rules.

Question 70. Which of the following represents neo-pentyl alcohol?

1. CH₃CH(CH₃)CH₂CH₂OH
2. (CH₃)₃C-CH₂OH
3. CH₃(CH₂)₃ OH
4. CH₃CH₂CH(OH)C₂H₅

Answer: 2. (CH₃)₃C-CH₂OH

Solution: (CH₃)₃C-CH₂OH is neo-pentyl alcohol.

Question 71. IUPAC name of the compound, ClCH₂ CH₂ COOH is:

1. 3-chloropropanoic acid
2. 2-chloropropanoic acid
3. 2-chloroethanoic acid
4. Chlorosuccinic acid

Answer: 1. 3-chloropropanoic acid

Solution: Follow IUPAC rules.

Question 72. Which of the following IUPAC names is correct?

1. 2-methyl-3-ethyl pentane
2. 2-ethyl-3-methyl pentane
3. 3-ethyl-2-methyl pentane
4. 3-methyl-2-ethyl pentane

Answer: 3. 3-ethyl-2-methyl pentane

Solution: -do-

Question 73. IUPAC name of, (C₂H₅)₂CHCH₂OH is:

1. 2-ethyl butanol-1
2. 2-methyl pentanol-1
3. 2-ethyl pentanol-1
4. 3-ethyl butanol-1

Answer: 1. 2-ethyl butanol-1

Solution: Follow IUPAC rules.

Question 74. 3-phenylpropanoid acid is IUPAC name of:

1. Mendaleic acid
2. Pyruvic acid
3. Succinic acid
4. Cinnamic acid

Answer: 4. Cinnamic acid

Solution: C₆ H₅—CH=CHCOOH is cinnamic acid.

Question 75. IUPAC name of the compound is:

1. 1,2,3-trieyanopropane
2. Propane-1,2,3-tricarbonitrile
3. 1,2,3-cyclopropane
4. Propane triarylamine

Answer: 2. Propane-1,2,3-tricarbonitrile

Solution: Follow IUPAC rules.

Question 76. IUPAC name of the compound is

1. 4-isopropyl, 6-methyl octane
2. 3-methyl, 5-(1-methyl ethyl) octane
3. 3-methyl, 5-isopropyl octane
4. 6-methyl, 4-(1-methyl ethyl) octane

Answer: 2. 3-methyl, 5-(1-methyl ethyl) octane

Solution: IUPAC name of compound.

Straight chain which contains a large number of side chains is taken as the parent chain and the counting starts from that side where the side chain is nearest.

Question 77. IUPAC name of the compound is:

1. 4-bromo-3-ethyl-1,4-pentadiene
2. 2-bromo-3-ethyl-1,4pentadiene
3. 2-bromo-3-ethyl-1-5-pentadiene
4. None of the above

Answer: 2. 2-bromo-3-ethyl-1,4pentadiene

Solution: The IUPAC name of this molecule is 2-bromo-3-ethyl-1, 4-pentadiene.

Question 78. IUPAC name of the compound is:

1. 4,5-dimethyl oct-4-ene
2. 3,4-dimethyl oct-5-ene
3. 4,5-dimethyl oct-5-ene
4. None of the above

Answer: 1. 4,5-dimethyl oct-4-ene

Solution: Follow IUPAC rules.

Question 79. The correct IUPAC name of the following compound is

1. 5, 6-dimethyl-8-methyl dec-6-ene
2. 6-butyl-5-ethyl-3-methyl oct-4-ene
3. 5, 6-diethyl-3-methyl dec-4-ene
4. 2, 4, 5-triethyl non-3-ene

Answer: 3. 5, 6-diethyl-3-methyl dec-4-ene

Question 80. Which of the following compounds has incorrect IUPAC nomenclature?

Answer: 4

Question 81. The IUPAC name of the compound is

1. 1,2,3-tricarboxylic-2,1-propane
2. 3-carboxy-3-hydroxy-1,5-pentanoic acid
3. 3-hydroxy-3-carboxy-1,5-pentanoic acid
4. None of the above

Answer: 2. 3-carboxy-3-hydroxy-1,5-pentanoic acid

Solution: Follow IUPAC rules.

Question 82. IUPAC name of is

1. Bicyclo (2,1,0) pentane
2. 1,2-cyclopropyl Cyclobutane
3. Cyclopentane (4,3) annulene
4. 1,2-methylene Cyclobutane

Answer: 1. Bicyclo (2,1,0) pentane

Solution: Follow IUPAC rules.

Question 83. The IUPAC name of neopentane is:

1. 2,2-dimethylpropane
2. 2-methylpropane
3. 2,2-dimethylbutane
4. 2-methyl butane

Answer: 1. 2,2-dimethylpropane

Solution: Follow IUPAC rules.

Question 84. The IUPAC name of compound shown below is

1. 2-bromo-6- chlorocyclohex-1-ene
2. 6-bromo-2-chlorocyclohexene
3. 3-bromo-1-chlorocyclohexene
4. 1-bromo-3-chlorocyclohexene

Answer: 3. 3-bromo-1-chlorocyclohexene

Solution:

Unsaturation (double bond) is given priority over halogen, then the lowest set of locants. So, the correct IUPAC name is 3-bromo-1-chlorocyclohexene.

Question 85. The IUPAC name of 

1. 4-hydroxy-1-methylpentanal
2. 4-hydroxy-4-methyl pent-2-en-1-al
3. 2-hydroxy-4-methyl pent-2-en-5-al
4. 2-hydroxy-3-methyl pent-2-en-5-al

Answer: 2. 4-hydroxy-4-methyl pent-2-en-1-al

Solution: Follow IUPAC rules.

Question 86. IUPAC’s name of is 

1. 3-chlorobutanol
2. 3-chlorobutanaldehyde
3. 3-chlorobutanol
4. 2-chlorobutanol

Answer: 3. 3-chlorobutanol

Solution:

The order is priority is -CHO > -Cl

Question 87. The IUPAC name of is 

1. 2-methyl-3-butanone
2. 3-methyl-butan-2-one
3. 3-methyl butanone
4. None of these

Answer: 2. 3-methyl-butane-2-one

Solution: Follow IUPAC rules.

Question 88. The IUPAC name of compound is

1. 2-ethyl prop-2-en-1-ol
2. 2-hydroxymethylbutan -1-ol
3. 2-methylenebutan-1-ol
4. 2-ethyl-3-hydroxypropyl-1-ene

Answer: 1. 2-ethyl prop-2-en-1-ol

Solution:

Question 89. Which nomenclature is not according to the IUPAC system?

Answer: 3

Solution: CH₂=CH-CH₂-Br is allyl bromide. Its IUPAC name is 3-bromopropene or 3-bromoprop-1-ene. Because here double bond is a functional group while halogen is a substituent. Double bond is given more priority and hence numbering starts from left.

Question 90. Acetonitrile is

1. CH₃CN
2. CH₃COCN
3. C₂H₅CN
4. C₆H₅CN

Answer: 1. CH₃CN

Solution: CH₃ C=N is known as acetonitrile or methyl cyanide.

Question 91. Isobutyl chloride is:

1. CH₃CH₂CH₂CH₂Cl
2. (CH₃)₂CHCH₂ Cl
3. CH₃CH₂CHClCH₃
4. (CH₃)₃C-Cl

Answer: 2. (CH₃)₂CHCH₂ Cl

Solution: It should contain (CH₃)₂CH- group to be named as iso.

Question 92. The given compound in IUPAC is called as

1. Diacetone
2. Acetone amine
3. Diacetone amine
4. 4-amino-4-methyl pentane-2-one

Answer: 4. 4-amino-4-methyl pentane-2-one

Solution: Follow IUPAC rules.

Question 93. The IUPAC name of compound is

1. 1-choloro-2,3-epoxypropane
2. 3-chloro-1,2-epoxypropane
3. 1-chloroethoxymethane
4. None of the above

Answer: 2. 3-chloro-1,2-epoxypropane

Solution: Follow IUPAC rules.

Question 94. Neo-heptyl alcohol is correctly represented as:

Answer: 3

Solution: Follow IUPAC rules.

Question 95. IUPAC name of the compound is CH₃ CH₂ C(Br)=CH-Cl

1. 2-bromo-1-chloro butene-1
2. 1-chloro-2-bromo butene-1
3. 3-chloro-2-bromo butene-2
4. None of the above

Answer: 1. 2-bromo-1-chloro butene-1

Solution: Follow IUPAC rules.

Question 96. The IUPAC name of CH₃-CH₂-CHO is

1. Propanal-1
2. 2-methyl butanal
3. Butanal-1
4. Pentanal-1

Answer: 1. Propanal-1

Solution: IUPAC name of CH₃ CH₂ CHO is propan-1-al.

Question 97. The IUPAC name of is

1. 4-hydroxy-1-methylpentanal
2. 4-hydroxy-2-methylpentanal
3. 3-hydroxy-2-methylpentanal
4. 3-hydroxy-3-methylpentanal

Answer: 2. 4-hydroxy-2-methylpentanal

Solution: Follow IUPAC rules.

Question 98. Select the correct statement:

1. The prefixes are written before the name of compound
2. The suffixes are written after the name of compound
3. The IUPAC name of a compound is always written as one word
4. All of the above

Answer: 4. All of the above

Solution: These are the IUPAC rules.

Question 99. Pick out the correct statement from the following and choose the correct answer from the codes given below

1. Hexa-1, 5-diene is a conjugated diene
2. Prop-1, 2-diene is conjugated diene
3. Hexa-1, 3-diene is a conjugated diene
4. Buta-1, 3-diene is an isolated diene
5. Prop-1, 2-diene is a cumulative diene

 

1. 1, 2
2. 2, 3
3. 4, 5
4. 2, 5

Answer: 3. 4, 5

Solution: In conjugated diene alternate single and double bonds are present while in cumulative diene, double bonds are present at adjacent positions.

Hence, statements 3 and 5 are correct.

Question 100. The IUPAC name for

1. 1,1-dimethyl-1,2-butanediol
2. 2-methyl-2,4-pentanediol
3. 4-methyl-2,4-pentanediol
4. 1,3,3-dimethyl-1,3-propanediol

Answer: 2. 2-methyl-2,4-pentanediol

Solution: -do-

Question 101. Formulae of phenyl carbinol and chloral are respectively:

1. C₆ H₅.CH₂ CH₂ OH and CHCl₂ CHO
2. C₆ H₅ CH₂ OH and CCl₃ CHO
3. C₆ H₅ OH and CH₂ Cl.CHO
4. C₆ H₅ CHO and CHCl₂ CHO

Answer: 2. C₆ H₅ CH₂ OH and CCl₃ CHO

Solution: Carbinol is trivial name for HCH₂ OH. Thus, C₆ H₅ CH₂ OH is phenyl carbinol and chloral is CCl₃ CHO.

Question 102. The correct name for the following hydrocarbon is

1. Tricycle [4.1.0] heptane
2. Bicyclo [5.2.1] heptane
3. Bicyclo [4.1.0] heptane
4. Bicyclo [4.1.0] hexane

Answer: 3. Bicyclo [4.1.0] heptane

Solution:

This compound contains 7 carbon atoms, so the corresponding alkane is heptane. Two bridges contain 4 and 1 carbon atom respectively and one bridge does not contain any carbon atom. So, the name of the compound is Bicyclo (4,1,0) heptane.

Question 103. The IUPAC name of the compound is:

1. 5-chloro-hex-2-ene
2. 2-chloro-hex-5-ene
3. l-chloro-1-methyl-pent-3-ene
4. 5-chloro-5-methyl-pent-2-ene

Answer: 1. 5-chloro-hex-2-ene

Solution: First the longest continuous chain of carbon atoms is selected. Number the chain from the side containing senior functional group (i.e., the group placed above in the seniority table).

Question 104. The IUPAC name of the compound is:

1. 1,1-diethyl1-2, 2-dimethyl pentane
2. 4,4-dimethyl-5,5-diethyl pentane
3. 5, 5-diethyl-4,4-dimethyl pentane
4. 3-ethyl-4,4-dimethyl heptane

Answer: 4. 3-ethyl-4,4-dimethyl heptane

Solution: -do-

Question 105. 2, 3-dimethyl hexane contains _______ tertiary ____ secondary and ______ primary carbon atoms, respectively

1. 2, 2, 4
2. 2, 4, 3
3. 4, 3, 2
4. 3, 2, 4

Answer: 1. 2, 2, 4

Solution: The structure of 2, 3-dimethyl hexane is

So, the number of tertiary carbon atoms = 2

The number of secondary carbon atoms = 2

The number of primary carbon atoms = 4

Question 106. IUPAC name of following compound is:

1. 2-cyclohexyl butane
2. 2-phenylbutazone
3. 3-cyclohexyl butane
4. 3-phenylbutazone

Answer: 2. 2-phenylbutazone

Solution: Follow IUPAC rules.

Question 107. 2-methyl-2-butene will be represented as:

Answer: 4

Question 108. Pick out the alkane which differs from the other members of the group

1. 2,2-dimethyl propane
2. Pentane
3. 2-methyl butane
4. 2, 2-dimethyl butane

Answer: 4. 2, 2-dimethyl butane

Solution: 2, 2-dimethyl butane is 6-carbon hydrocarbon (C₆ H₁₄)

Question 109. In IUPAC suffix name of —COX is:

1. Oyl halide
2. Halo carbonyl
3. Carbamoyl
4. None of these

Answer: 1. Oyl halide

Solution: Follow IUPAC rules.

Question 110. IUPAC name of following compound is:

1. 3-methyl cyclo-1-buten-2-ol
2. 4-methyl cyclo-2-buten-1-ol
3. 4-methyl cyclo-1-buten-3-ol
4. 2-methyl cyclo-3-buten-1-ol

Answer: 2. 4-methyl cyclo-2-buten-1-ol

Solution: Follow IUPAC rules.

Question 111. The correct IUPAC name of the acid is

1. Z-3-ethyl-4-methyl hex-3-en-1-oic acid
2. Z-3-ethyl-4-methyl hexanoic acid
3. Z-3, 4-diethyl pent-3-en-1-oic acid
4. E-3-ethyl-4-methylhex-4-en-1-oic acid

Answer: 3. Z-3, 4-diethyl pent-3-en-1-oic acid

Solution:

[The configuration of this compound is E because bulkier groups are present opposite of the double bond.]

Question 112. The IUPAC name of aldehyde is

1. Prop-2-en-1-al
2. Propenyl aldehyde
3. But-2-en-1-al
4. Propenal

Answer: 1. Prop-2-en-1-al

Solution: CH2=CH-CHO (Prop -2-en-1-al)

Question 113. Write the IUPAC name of the below compound.

1. 3-methoxy butane
2. 2-methoxy butane
3. 3-methyl-3-methoxy propane
4. Butoxy methane

Answer: 2. 2-methoxy butane

Solution: According to the IUPAC system ethers are named as alkoxy alkanes. The larger alkyl group forms the parent chain while the lower alkyl group is taken with the ethereal oxygen and forms a part of the alkoxy group.

Question 114. IUPAC name of the compound is

1. 4-butyl-2,5-hexadien-l-al
2. 5-vinyloct-3-en-l-al
3. 5-vinyloct-5-en-8-al
4. 3-butyl-1,4-hexadien-6-al

Answer: 1. 4-butyl-2,5-hexadien-l-al

Solution: Follow IUPAC rules.

Question 115. The IUPAC name of the compound is

1. Ethoxy propane
2. 1, 1-dimethyl ether
3. 2-ethoxy zso-propane
4. 2-ethoxy propane

Answer: 4. 2-ethoxy propane

Solution:

The above compound is an ether and its name is written as alkoxy alkane. Oxy is attached to the lower group. Hence, the IUPAC name of the above compound is 2-ethoxy propane.

Question 116. The IUPAC name of the compound

1. Ethane nitrile
2. Methane isonitrile
3. Ethane isonitrile
4. None of these

Answer: 2. Methane isonitrile

Solution: CH₃NC is methaneisonitrile.

Question 117. The structural formula of methyl aminomethane is:

1. (CH₃)₂ CHNH₂
2. (CH₃)₃ N
3. (CH₃)₂ NH
4. CH₃ NH₂

Answer: 3. (CH₃)₂ NH

Solution: IUPAC name is N-methyl methanamine.

Question 118. The IUPAC name of CH₃-CCH(CH₃)₂ is

1. 4-methyl-2-pentyne
2. 4, 4-dimethyl-2-butyne
3. methyl isopropyl acetylene
4. 2-methyl-4-pentyne

Answer: 1. 4-methyl-2-pentyne

Solution: Follow IUPAC rules.

Question 119. Which one of the following is the correct formula for dichlorodiphenyltrichloroethane?

Answer: 1

Solution: Follow IUPAC rules.

Question 120. IUPAC name of (CH₃)₂N-C₂H₅ is:

1. Dimethyl ethyl amine
2. Dimethyl aminomethane
3. Dimethyl aminoethane
4. N, N-dimethylethanolamine

Answer: 4. N, N-dimethylethanolamine

Question 121. 3-methyl penta-1,3-diene is:

1. CH₂=CH(CH₂)₂CH₃
2. CH₂=CHCH(CH₃)CH₂CH₃
3. CH₃CH=C(CH₃)CH=CH₂
4. CH₃-CH=CH(CH₃)₂

Answer: 3. CH₃CH=C(CH₃)CH=CH₂

Solution: Follow IUPAC rules.

Question 122. The IUPAC name of the compound is

1. 2-iodo-3-chloro-4-pentanoic acid
2. 4-oxo-3-chloro-2-iodo Pentanoic acid
3. 4-carboxy-4,3-chloro-2-butanone
4. 3-chloro-2-iodo-4-oxo-pentanoic acid

Answer: 4. 3-chloro-2-iodo-4-oxo-pentanoic acid

Solution: Report prefixes in alphabetical order.

Question 123. The IUPAC name for CH₃COCH(CH₃)₂ is:

1. 4-methyl isopropyl ketone
2. 3-methyl-2-butanone
3. Isopropyl methyl ketone
4. 2-methyl-3-butanone

Answer: 2. 3-methyl-2-butanone

Question 124. Give the IUPAC name of the compound

1. 1,1,3-trimethyl cyclo hex-2-ene
2. 1,3,3-trimethyl cyclo hex-l-ene
3. 1,1,5-trimethyl cyclo hex-5-ene
4. 2,6,6-trimethyl cyclo hex-l-ene

Answer: 2. 1,3,3-trimethyl cyclo hex-l-ene

Solution: Follow IUPAC rules.

Question 125. The name of the compound is:

1. (2Z,4Z)-2, 4-hexadiene
2. (2Z-, 4E)-2, 4-hexadiene
3. (2E, 4Z)-2, 4-hexadiene
4. (4E, 4Z)-2, 4-hexadiene

Answer: 1. (2Z,4Z)-2, 4-hexadiene

Solution: The name of the compound is (2Z,4Z)-2, 4-hexadiene.

Question 126. The IUPAC name of the compound is

1. 2-amino-3-hydroxy propanoic acid
2. l-hydroxy-2-amino propan-3-oic acid
3. l-amino-2-hydroxy propanoic acid
4. 3-hydroxy-2-amino propanoic acid

Answer: 1. 2-amino-3-hydroxy propanoic acid

Solution: Follow IUPAC rules.

Question 127. What is the formula of tertiary butyl alcohol?

1. CH₃-CH(CH₃)-CH₂-OH
2. CH₃-(CH₂)₂OH
3. CH₃-CH(OH)-CH₂-CH₃

Answer: 4. CH₃-CH(OH)-CH2-CH₃

Solution:

is the formula of tertiary butyl alcohol as in it – OH group is attached to tertiary carbon.

Question 128. The IUPAC name of the compound is

1. 2-ethoxy pentane
2. 4-ethoxy pentane
3. Pentyl-ethyl ether
4. 2-pentoxy ethane

Answer: 1. 2-ethoxy pentane

Solution: Follow IUPAC rules.

Question 129. The IUPAC name of the compound is

1. 2-ethyl-3-methyl butanol chloride
2. 2,3-dimethyl pentanol chloride
3. 3,4-dimethyl pentanol chloride
4. l-chloro-l-oxo-2,3-dimethyl pentane

Answer: 2. 2,3-dimethyl pentanol chloride

Question 130. The IUPAC name of the compound is

1. 1,2,3-trihydrosypropane
2. 3-hydroxy pentane-l,5-diol
3. 1,2,3-hydroxy-propane
4. Propane-1,2,3-triol

Answer: 4. Propane-1,2,3-triol

Solution: Follow IUPAC rules.

Question 131. The IUPAC name of is

1. 2-methyl-3-bromohexanal
2. 3-bromo-2-methylbutanal
3. 2-bromo-3-bromobutanal
4. 3-bromo-2-methylpentanal

Answer: 4. 3-bromo-2-methylpentanal

Solution: Follow IUPAC rules.

Question 132. The IUPAC name of

1. 4-propoxy pentane
2. Pentyl-propyl ether
3. 2-propoxy pentane
4. 2-pentoxy propane

Answer: 3. 2-propoxy pentane

Solution: Follow IUPAC rules.

Question 133. The systematic (IUPAC) name of the compound with the following structural formula shall be

1. 1-ethyl-2-methyl cyclohexene
2. 2-methyl-l-ethyl cyclohexene
3. 3-ethyl-2-methyl cyclohexene
4. 4-ethyl-3-methyl cyclohexene

Answer: 4. 4-ethyl-3-methyl cyclohexene

Solution: Follow IUPAC rules.

Question 134. Pyridine is:

1. An aromatic compound and a primary base
2. A heterocyclic amino compound and a tertiary base
3. An aromatic amino compound forms salts
4. A cyano derivative of benzene and a secondary base

Answer: 2. A heterocyclic amino compound and a tertiary base

Solution: Pyridine is a heterocyclic compound having six carbon-membered ring formed by C and N atoms

Question 135. The IUPAC name of (CH₃)₃C-CH=CH₂ is

1. 1, 1, 1-trimethyl-2-propene
2. 3, 3, 3-trimethyl-2-propene
3. 2, 2-dimethyl-3-butene
4. 3, 3-dimethyl-1-butene

Answer: 4. 3, 3-dimethyl-1-butene

Solution:

IUPAC name=3, 3-dimethyl-l-butene.

Question 136. The name of the compound is:

1. 2-pentanone
2. Pentanone-2
3. Pentan-2-one
4. All are correct

Answer: 4. All are correct

Question 137. Write the IUPAC name of

1. 3-methyl pentane-3-ol
2. 3-hydroxy hexane
3. 3-hydroxy-3-methyl pentane
4. All of the above

Answer: 1. 3-methyl pentane-3-ol