Functional Groups and Nomenclature - Numerical Applications
Q. What is the correct IUPAC name for the compound with the formula C4H10O?
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A.
Butanol
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B.
Butan-1-ol
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C.
2-Butanol
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D.
Butan-2-ol
Solution
The longest carbon chain has four carbons and the hydroxyl group is on the first carbon, making it Butan-1-ol.
Correct Answer: B — Butan-1-ol
Q. What is the IUPAC name for the compound CH3-CH(OH)-CH2-COOH?
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A.
3-Hydroxybutanoic acid
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B.
2-Hydroxybutanoic acid
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C.
Butanoic acid
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D.
Butanol
Solution
The compound has a hydroxyl group on the second carbon of a four-carbon chain with a carboxylic acid, making it 2-Hydroxybutanoic acid.
Correct Answer: B — 2-Hydroxybutanoic acid
Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CHO?
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A.
Butanal
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B.
Pentanal
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C.
Propionaldehyde
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D.
Butyric acid
Solution
The compound has four carbons and an aldehyde functional group, making it Butanal.
Correct Answer: A — Butanal
Q. Which functional group is present in the compound CH3-CO-CH2-CH3?
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A.
Alcohol
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B.
Ketone
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C.
Aldehyde
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D.
Carboxylic acid
Solution
The compound contains a carbonyl group (C=O) between two carbon atoms, classifying it as a ketone.
Correct Answer: B — Ketone
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