Functional Groups and Nomenclature - Competitive Exam Level
Q. What is the IUPAC name for the compound CH3-CH2-CH(CH3)-C(=O)OH?
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A.
3-Methylbutanoic acid
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B.
2-Methylbutanoic acid
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C.
4-Methylbutanoic acid
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D.
Pentanoic acid
Solution
The longest chain has four carbons with a carboxylic acid group, making it 2-Methylbutanoic acid.
Correct Answer: B — 2-Methylbutanoic acid
Q. What is the IUPAC name for the compound with the formula C4H8O2 that has a double bond and a carboxylic acid group?
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A.
Butenoic acid
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B.
Butanoic acid
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C.
2-Butenoic acid
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D.
3-Butenoic acid
Solution
The compound has a double bond and a carboxylic acid group, making it Butenoic acid.
Correct Answer: A — Butenoic acid
Q. What is the IUPAC name for the compound with the structure CH3-CH2-CH2-CO-NH2?
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A.
Butanamide
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B.
Butanoic acid
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C.
Propionamide
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D.
Pentanoic acid
Solution
The compound has a four-carbon chain with an amide functional group, making it Butanamide.
Correct Answer: A — Butanamide
Q. Which of the following is the functional group of amines?
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A.
-OH
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B.
-NH2
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C.
-COOH
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D.
-C=O
Solution
Amines contain the amino group (-NH2) as their functional group.
Correct Answer: B — -NH2
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