alleryThe functional group in acetic acid (CH₃COOH) is
AHydroxyl (−OH)
BKetone (>C=O)
CCarboxyl (−COOH)
DAldehyde (−CHO)
Answer & Solution
Correct answer: C. Carboxyl (−COOH)
1. Acetic acid structure: CH₃−COOH.
2. The −COOH group is called the carboxyl (or carboxylic acid) group.
3. It combines a hydroxyl (−OH) with a carbonyl (>C=O) on the same carbon.
4. This makes the compound acidic (H⁺ ionises).
_Source: syllabus Science, Ch 4 "Carbon and its Compounds", §4.2.4_
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