Which acidic functional group is present in the drug shown?

ACarboxylic acid
BEnol
CSulphonic acid
DPhenol

Answer: A

The compound shown is ibuprofen, 2-(4-isobutylphenyl)propanoic acid, a non-steroidal analgesic. Its only acidic group is the -COOH group on the side chain; the ring carries no OH.

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