Which of the following is an example of aromatic carboxylic acid?
Correct answer: D. Phthalic acid
- A. Ethanoic acid
- B. Butanoic acid
- C. Adipic acid
- D. Phthalic acid
Explanation
Option A) Ethanoic acid, also known as acetic acid, is a simple carboxylic acid but it is not aromatic. It has a two-carbon chain and a methyl group attached to the carbonyl carbon. Option B) Butanoic acid, also known as butyric acid, is a simple carboxylic acid but it is not aromatic. It has a four-carbon chain and a methyl group attached to the carbonyl carbon. Option C) Adipic acid is a dicarboxylic acid but it is not aromatic. It has a six-carbon chain with two carboxylic acid groups attached to carbons 1 and 6. Option D) The structures of the acids are as shown below. Only Phthalic acid contains an aromatic (benzene) ring.
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About Carboxylic Acids
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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