Q. What is the IUPAC name for the compound with the formula CH3-CO-CH2-CH3?
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A.
Butan-2-one
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B.
Butan-1-one
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C.
Propan-2-one
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D.
Pentanal
Solution
The compound is a ketone with 4 carbons, and the carbonyl group is on the second carbon, making it Butan-2-one.
Correct Answer: A — Butan-2-one
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Q. What is the IUPAC name for the compound with the structure CH3-CH(CH3)-C(CH3)2-COOH?
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A.
2-Methyl-3-pentanoic acid
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B.
3-Methyl-2-pentanoic acid
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C.
2,3-Dimethylbutanoic acid
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D.
3,3-Dimethylbutanoic acid
Solution
The compound has a carboxylic acid and two methyl groups on the third carbon, making it 3,3-Dimethylbutanoic acid.
Correct Answer: D — 3,3-Dimethylbutanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CH(CH3)-C(CH3)2-CH2-CH3?
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A.
2,3-Dimethylpentane
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B.
3,3-Dimethylpentane
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C.
2,2-Dimethylpentane
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D.
3-Methylpentane
Solution
The longest chain has 5 carbons, with two methyl groups on the third carbon, so the name is 3,3-Dimethylpentane.
Correct Answer: B — 3,3-Dimethylpentane
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Q. What is the IUPAC name for the compound with the structure CH3-CH(CH3)-CH2-CHO?
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A.
2-Methylbutanal
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B.
3-Methylbutanal
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C.
2-Butanal
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D.
3-Butanal
Solution
The longest chain has four carbons, and the aldehyde is at the end, making it 2-Methylbutanal.
Correct Answer: A — 2-Methylbutanal
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Q. What is the IUPAC name for the compound with the structure CH3-CH(CH3)-CH2-COOH?
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A.
2-Methylbutanoic acid
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B.
3-Methylbutanoic acid
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C.
2-Butenoic acid
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D.
3-Butenoic acid
Solution
The longest chain has four carbons, and the methyl group is on the second carbon, hence it is 2-Methylbutanoic acid.
Correct Answer: A — 2-Methylbutanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-C(=O)-OH?
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A.
3-Hydroxybutanoic acid
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B.
2-Hydroxybutanoic acid
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C.
3-Methylbutanoic acid
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D.
2-Methylbutanoic acid
Solution
The compound has a hydroxyl group on the second carbon of a four-carbon chain, making it 2-Hydroxybutanoic acid.
Correct Answer: B — 2-Hydroxybutanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH(CH3)-OH?
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A.
2-Propanol
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B.
1-Butanol
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C.
2-Butanol
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D.
3-Butanol
Solution
The longest chain has four carbons, and the hydroxyl group is on the second carbon, making it 2-Butanol.
Correct Answer: C — 2-Butanol
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-CH2-COOH?
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A.
Hexanoic acid
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B.
Pentanoic acid
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C.
Heptanoic acid
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D.
Octanoic acid
Solution
The longest chain has six carbons, and the functional group is a carboxylic acid, hence the name is Hexanoic acid.
Correct Answer: A — Hexanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-CH=CH2?
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A.
1-Hexene
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B.
2-Hexene
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C.
3-Hexene
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D.
Cyclohexene
Solution
The compound is an alkene with a double bond at the first carbon, named 1-Hexene.
Correct Answer: A — 1-Hexene
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-CHO?
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A.
Butanal
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B.
Pentanal
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C.
Hexanal
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D.
Heptanal
Solution
The longest chain has five carbons and ends with an aldehyde, hence it is Pentanal.
Correct Answer: B — Pentanal
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CH2-COOH?
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A.
Pentanoic acid
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B.
Hexanoic acid
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C.
Butanoic acid
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D.
Heptanoic acid
Solution
The compound has a carboxylic acid functional group and a five-carbon chain, making it Pentanoic acid.
Correct Answer: A — Pentanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-COOH?
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A.
Butanoic acid
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B.
Propanoic acid
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C.
Pentanoic acid
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D.
Hexanoic acid
Solution
The compound has a carboxylic acid functional group and a four-carbon chain, making it Butanoic acid.
Correct Answer: A — Butanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH=CH2?
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A.
1-Butene
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B.
2-Butene
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C.
Butyne
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D.
Butane
Solution
The compound has a double bond between the first and second carbons, making it 1-Butene.
Correct Answer: A — 1-Butene
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-CO-CH3?
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A.
Butan-2-one
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B.
Propan-2-one
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C.
Butan-1-one
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D.
Pentanal
Solution
The compound is a ketone with four carbons and the carbonyl group on the second carbon, hence it is Butan-2-one.
Correct Answer: A — Butan-2-one
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Q. What is the IUPAC name for the compound with the structure CH3-CH2-COOH?
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A.
Propanoic acid
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B.
Butanoic acid
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C.
Acetic acid
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D.
Methanoic acid
Solution
The compound is a carboxylic acid with 3 carbons, named Propanoic acid.
Correct Answer: A — Propanoic acid
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Q. What is the IUPAC name for the compound with the structure CH3-CO-CH2-COOH?
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A.
3-Oxobutanoic acid
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B.
2-Oxobutanoic acid
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C.
Butanoic acid
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D.
Acetic acid
Solution
The compound has a ketone and a carboxylic acid, making it 3-Oxobutanoic acid.
Correct Answer: A — 3-Oxobutanoic acid
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Q. What is the IUPAC name of CH2=CH-CH2-CH3?
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A.
1-Butene
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B.
2-Butene
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C.
Propene
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D.
Butyne
Solution
The correct IUPAC name for CH2=CH-CH2-CH3 is 1-Butene, as the double bond is at the first carbon.
Correct Answer: A — 1-Butene
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Q. What is the IUPAC name of CH3-CH2-CH(CH3)-CH2-CH3?
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A.
2-Pentyl
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B.
3-Pentyl
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C.
2-Methylpentane
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D.
3-Methylpentane
Solution
The longest carbon chain has 5 carbons, and there is a methyl group on the second carbon, making it 2-Methylpentane.
Correct Answer: C — 2-Methylpentane
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Q. What is the IUPAC name of CH3-CH2-CH2-CH3?
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A.
Butane
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B.
Propane
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C.
Pentane
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D.
Hexane
Solution
The longest carbon chain has 4 carbons, so the IUPAC name is butane.
Correct Answer: A — Butane
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Q. What is the IUPAC name of CH3-CH2-CH2-CHO?
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A.
Butanal
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B.
Propionaldehyde
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C.
Pentanal
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D.
Hexanal
Solution
The compound is a four-carbon aldehyde, hence its IUPAC name is Butanal.
Correct Answer: A — Butanal
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Q. What is the IUPAC name of CH3-CH2-CH2-COOH?
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A.
Butanoic acid
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B.
Propanoic acid
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C.
Pentanoic acid
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D.
Hexanoic acid
Solution
The longest carbon chain contains four carbons, and the functional group is a carboxylic acid, hence the name is Butanoic acid.
Correct Answer: A — Butanoic acid
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Q. What is the IUPAC name of CH3-CH2-CHO?
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A.
Ethanal
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B.
Propanal
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C.
Butanal
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D.
Methanal
Solution
The compound CH3-CH2-CHO is an aldehyde and is named ethanal.
Correct Answer: A — Ethanal
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Q. What is the IUPAC name of CH3-CH2-COOH?
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A.
Propanoic acid
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B.
Butanoic acid
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C.
Acetic acid
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D.
Methanoic acid
Solution
The compound CH3-CH2-COOH has three carbon atoms and is a carboxylic acid, thus it is named propanoic acid.
Correct Answer: A — Propanoic acid
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Q. What is the IUPAC name of CH3CH2CH(OH)CH3?
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A.
2-Butanol
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B.
1-Butanol
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C.
Propan-2-ol
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D.
Butan-2-ol
Solution
The compound is Butan-2-ol, as the hydroxyl group is on the second carbon.
Correct Answer: D — Butan-2-ol
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Q. What is the IUPAC name of CH3CH2CH2OH?
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A.
Propan-1-ol
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B.
Butan-1-ol
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C.
Pentanol
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D.
Butanol
Solution
The compound CH3CH2CH2OH is named butan-1-ol as it has four carbon atoms and the hydroxyl group is on the first carbon.
Correct Answer: B — Butan-1-ol
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Q. What is the IUPAC name of CH3CH2Cl?
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A.
Chloroethane
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B.
Ethyl chloride
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C.
Ethane chloride
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D.
Chloromethane
Solution
The IUPAC name of CH3CH2Cl is Chloroethane, as it is a two-carbon alkane with a chlorine substituent.
Correct Answer: A — Chloroethane
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Q. What is the IUPAC name of CH3CH2OCH2CH3?
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A.
Ethyl methyl ether
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B.
Dimethyl ether
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C.
Diethyl ether
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D.
Ethyl ether
Solution
The compound CH3CH2OCH2CH3 is named diethyl ether, as it consists of two ethyl groups bonded to an oxygen atom.
Correct Answer: C — Diethyl ether
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Q. What is the IUPAC name of CH3CH2OH? (2021) 2021
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A.
Ethanol
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B.
Methanol
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C.
Propanol
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D.
Butanol
Solution
The compound CH3CH2OH is an alcohol with two carbon atoms, which is named Ethanol.
Correct Answer: A — Ethanol
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Q. What is the IUPAC name of CH3CHO?
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A.
Ethanal
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B.
Propanal
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C.
Acetaldehyde
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D.
Butanal
Solution
The IUPAC name of CH3CHO is ethanal, which is also known as acetaldehyde.
Correct Answer: A — Ethanal
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Q. What is the IUPAC name of CH3CHO? (2023) 2023
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A.
Acetaldehyde
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B.
Ethanal
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C.
Ethyl aldehyde
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D.
Methyl ketone
Solution
The IUPAC name of CH3CHO is ethanal, which is the simplest aldehyde.
Correct Answer: B — Ethanal
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