Isomerism and Stereochemistry - Competitive Exam Level
Q. What is the correct IUPAC name for the compound CH3-CH2-CH(CH3)-COOH?
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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.
2-methylpropanoic acid
Solution
The longest chain has 4 carbons with a carboxylic acid group, making it 2-methylbutanoic acid.
Correct Answer: B — 2-methylbutanoic acid
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Q. What is the IUPAC name for the compound with the formula C5H10O that has a carbonyl group on the second carbon?
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A.
2-pentanone
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B.
3-pentanone
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C.
2-pentanol
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D.
Pentanal
Solution
The compound is a ketone with the carbonyl group on the second carbon, making it 2-pentanone.
Correct Answer: A — 2-pentanone
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Q. What is the IUPAC name of the compound with the formula CH3-CH(CH3)-CH2-CHO?
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A.
3-methylbutanal
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B.
2-methylbutanal
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C.
4-methylbutanal
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D.
2-methylpropanal
Solution
The longest carbon chain contains 4 carbons, and the aldehyde group is at the end, making it 3-methylbutanal.
Correct Answer: A — 3-methylbutanal
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Q. What is the IUPAC name of the compound with the structure CH3-CH(CH3)-CH2-CH3?
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A.
2-methylbutane
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B.
3-methylbutane
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C.
2-pentene
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D.
2-butene
Solution
The longest carbon chain has 4 carbons (butane) with a methyl group on the second carbon, making it 2-methylbutane.
Correct Answer: A — 2-methylbutane
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Q. Which functional group is present in the compound CH3-CO-CH2-COOH?
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A.
Alcohol
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B.
Aldehyde
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C.
Ketone
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D.
Carboxylic acid
Solution
The compound contains a carboxylic acid functional group (-COOH) at the end of the carbon chain.
Correct Answer: D — Carboxylic acid
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Q. Which of the following compounds is an example of a racemic mixture?
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A.
Lactic acid
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B.
2-butanol
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C.
Glucose
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D.
Tartaric acid
Solution
Lactic acid can exist as two enantiomers, and a racemic mixture contains equal amounts of both.
Correct Answer: A — Lactic acid
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