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Functional group of carboxylic acid:

A–OH
B–CHO
C–COOH (carboxyl)
DC=O
Answer & Solution
Correct answer: C. –COOH (carboxyl)
–COOH: combines hydroxyl (–OH) and carbonyl (C=O) on same C. e.g., HCOOH (formic), CH₃COOH (acetic acid).
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