Q. Which of the following is the correct IUPAC name for C3H7-COOH?
A.
Propanoic acid
B.
Butanoic acid
C.
Pentanoic acid
D.
Hexanoic acid
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Solution
The compound has 3 carbons in the longest chain and a carboxylic acid group, hence it is Propanoic acid.
Correct Answer: A — Propanoic acid
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Q. Which of the following is the correct IUPAC name for C5H10?
A.
Pentane
B.
Cyclopentane
C.
1-Pentene
D.
2-Pentene
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Solution
C5H10 corresponds to pentane, which is a straight-chain alkane with 5 carbon atoms.
Correct Answer: A — Pentane
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Q. Which of the following is the correct IUPAC name for C6H12?
A.
Hexane
B.
Cyclohexane
C.
2-Hexene
D.
1-Hexyne
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Solution
C6H12 is a straight-chain alkane with 6 carbons, which is named Hexane.
Correct Answer: A — Hexane
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Q. Which of the following is the correct IUPAC name for C6H5-CH2-CH2-COOH?
A.
Phenylbutanoic acid
B.
Butylbenzoic acid
C.
Benzoic acid
D.
Phenylpropanoic acid
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Solution
The compound has a phenyl group attached to a butanoic acid structure, making it Phenylbutanoic acid.
Correct Answer: A — Phenylbutanoic acid
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Q. Which of the following is the correct IUPAC name for C6H5-CH2-CH3?
A.
Ethylbenzene
B.
Phenylpropane
C.
Benzyl ethane
D.
Benzene ethyl
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Solution
The compound has a phenyl group attached to an ethyl group, making it Ethylbenzene.
Correct Answer: A — Ethylbenzene
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Q. Which of the following is the correct IUPAC name for CH3-CH2-CH(CH3)-OH?
A.
2-Methylpropan-1-ol
B.
3-Methylbutan-1-ol
C.
2-Methylbutan-1-ol
D.
3-Methylpropan-1-ol
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Solution
The longest chain has four carbons, and the hydroxyl group is on the first carbon, with a methyl group on the second carbon, making it 2-Methylbutan-1-ol.
Correct Answer: C — 2-Methylbutan-1-ol
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Q. Which of the following is the correct IUPAC name for the compound C2H5-CHO?
A.
Ethanal
B.
Propanoic acid
C.
Acetaldehyde
D.
Ethyl aldehyde
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Solution
The compound is an aldehyde with two carbons, hence the IUPAC name is Ethanal.
Correct Answer: A — Ethanal
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Q. Which of the following is the correct IUPAC name for the compound C3H6O?
A.
Propylene oxide
B.
Acetone
C.
Propanal
D.
Cyclopropanol
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Solution
C3H6O can be identified as Propanal, which is an aldehyde with three carbons.
Correct Answer: C — Propanal
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH(CH3)-C(CH3)2-COOH?
A.
2-Hydroxy-3-methylpentanoic acid
B.
3-Methyl-2-pentanoic acid
C.
2-Methyl-3-pentanoic acid
D.
3-Hydroxy-2-methylpentanoic acid
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Solution
The longest chain has 5 carbons, with a methyl group on the second carbon and a carboxylic acid on the first, making it 3-Methyl-2-pentanoic acid.
Correct Answer: B — 3-Methyl-2-pentanoic acid
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH2-CH(CH3)-OH?
A.
2-Propanol
B.
1-Butanol
C.
2-Butanol
D.
3-Butanol
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Solution
The compound has a hydroxyl group on the second carbon of a four-carbon chain, making it 2-Butanol.
Correct Answer: C — 2-Butanol
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH2-CH(CH3)-C≡C-H?
A.
3-Methyl-1-pentyne
B.
2-Methyl-1-pentyne
C.
1-Methyl-2-pentyne
D.
1-Methyl-3-pentyne
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Solution
The compound has a triple bond and the longest chain has five carbons, making it 3-Methyl-1-pentyne.
Correct Answer: A — 3-Methyl-1-pentyne
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH2-CH2-CH2-COOH?
A.
Pentanoic acid
B.
Butanoic acid
C.
Hexanoic acid
D.
Heptanoic acid
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Solution
The compound is a carboxylic acid with 5 carbons, named Pentanoic acid.
Correct Answer: A — Pentanoic acid
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Q. Which of the following is the correct IUPAC name for the compound CH3-CH2-CH2-CHO?
A.
Butanal
B.
Propionaldehyde
C.
Pentanal
D.
Ethanal
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Solution
The compound has a four-carbon chain with an aldehyde functional group, so it is named Butanal.
Correct Answer: A — Butanal
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Q. Which of the following is the correct IUPAC name for the compound with the formula C6H5-CH2-CHO?
A.
Benzaldehyde
B.
Benzylaldehyde
C.
Phenylacetaldehyde
D.
Phenylaldehyde
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Solution
The compound has a benzyl group attached to an aldehyde, making it Benzylaldehyde.
Correct Answer: B — Benzylaldehyde
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Q. Which of the following is the correct IUPAC name for the compound with the formula C3H7-COOH?
A.
Propanoic acid
B.
Butanoic acid
C.
Acetic acid
D.
Isobutyric acid
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Solution
The compound has three carbons in the longest chain and a carboxylic acid functional group, making it Propanoic acid.
Correct Answer: A — Propanoic acid
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Q. Which of the following is the correct IUPAC name for the compound with the formula C5H10?
A.
Pentene
B.
Cyclopentane
C.
Pentane
D.
2-Pentene
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Solution
The compound is a straight-chain alkane with five carbons, hence the name is Pentane.
Correct Answer: C — Pentane
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Q. Which of the following is the correct IUPAC name for the compound with the formula C6H5-CH2-CH2-COOH?
A.
Phenylbutanoic acid
B.
Butylphenyl acid
C.
Benzoic acid
D.
Phenylpropanoic acid
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Solution
The compound has a phenyl group attached to a butanoic acid, making it Phenylbutanoic acid.
Correct Answer: A — Phenylbutanoic acid
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Q. Which of the following is the correct IUPAC name for the compound with the formula C4H10?
A.
Butane
B.
Isobutane
C.
Butene
D.
Cyclobutane
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Solution
C4H10 is butane, which is a straight-chain alkane with 4 carbon atoms.
Correct Answer: A — Butane
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Q. Which of the following is the correct IUPAC name for the compound with the formula C2H5-CHO?
A.
Ethanal
B.
Propionaldehyde
C.
Acetaldehyde
D.
Butanal
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Solution
The compound is an aldehyde with two carbons, and its IUPAC name is Acetaldehyde.
Correct Answer: C — Acetaldehyde
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Q. Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-CH2-CHO?
A.
Hexanal
B.
Pentanal
C.
Heptanal
D.
Octanal
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Solution
The compound has a total of 6 carbons and an aldehyde functional group, making it Hexanal.
Correct Answer: A — Hexanal
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Q. Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-COOH?
A.
3-Methylbutanoic acid
B.
2-Methylbutanoic acid
C.
Butanoic acid
D.
Pentanoic acid
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Solution
The longest chain has four carbons with a methyl group on the second carbon, hence it is named 2-Methylbutanoic acid.
Correct Answer: B — 2-Methylbutanoic acid
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Q. Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-CHO?
A.
Butanal
B.
Pentanal
C.
Hexanal
D.
Heptanal
Show solution
Solution
The compound is an aldehyde with five carbons, hence the IUPAC name is Pentanal.
Correct Answer: B — Pentanal
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Q. Which of the following is the correct IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-OH?
A.
2-Methylpropan-1-ol
B.
2-Methylbutan-1-ol
C.
3-Methylbutan-1-ol
D.
1-Methylbutan-2-ol
Show solution
Solution
The compound has a hydroxyl group and the longest chain has four carbons, making it 3-Methylbutan-1-ol.
Correct Answer: C — 3-Methylbutan-1-ol
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Q. Which of the following is the functional group present in alcohols?
A.
-OH
B.
-COOH
C.
-NH2
D.
-CHO
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Solution
Alcohols contain the hydroxyl group (-OH) as their functional group.
Correct Answer: A — -OH
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Q. Which of the following pairs are enantiomers?
A.
D-Glucose and L-Glucose
B.
C2H6 and C2H5OH
C.
n-Butane and Isobutane
D.
C3H8 and C3H6
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Solution
D-Glucose and L-Glucose are mirror images of each other, making them enantiomers.
Correct Answer: A — D-Glucose and L-Glucose
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Q. Which of the following pairs are structural isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-pentanol and 2-pentanol
C.
Ethylene and acetylene
D.
Glucose and galactose
Show solution
Solution
1-pentanol and 2-pentanol differ in the position of the hydroxyl group, making them structural isomers.
Correct Answer: B — 1-pentanol and 2-pentanol
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Q. Which of the following pairs of compounds are enantiomers?
A.
D-Glucose and L-Glucose
B.
Cis-2-butene and Trans-2-butene
C.
1-butanol and 2-butanol
D.
Acetic acid and Propanoic acid
Show solution
Solution
D-Glucose and L-Glucose are mirror images of each other, making them enantiomers.
Correct Answer: A — D-Glucose and L-Glucose
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Q. Which of the following pairs of compounds are functional isomers?
A.
C2H6 and C2H5OH
B.
C3H8 and C3H6
C.
C4H10 and C4H8
D.
C5H12 and C5H10
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Solution
C2H6 (ethane) and C2H5OH (ethanol) have different functional groups, making them functional isomers.
Correct Answer: A — C2H6 and C2H5OH
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Q. Which of the following pairs of compounds are geometric isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-butanol and 2-butanol
C.
Ethylene and acetylene
D.
Cyclohexane and hexane
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Solution
Cis-2-butene and trans-2-butene differ in the arrangement of groups around the double bond, making them geometric isomers.
Correct Answer: A — Cis-2-butene and trans-2-butene
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Q. Which of the following pairs of compounds are structural isomers?
A.
Cis-2-butene and trans-2-butene
B.
1-pentanol and 2-pentanol
C.
Ethyl alcohol and dimethyl ether
D.
Glucose and galactose
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Solution
Ethyl alcohol (ethanol) and dimethyl ether have the same molecular formula but different structures.
Correct Answer: C — Ethyl alcohol and dimethyl ether
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