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The functional group in acetic acid (CH₃COOH) is
A{'text': 'Hydroxyl (−OH)', 'label': 'A'}
B{'text': 'Ketone (>C=O)', 'label': 'B'}
C{'text': 'Carboxyl (−COOH)', 'label': 'C'}
D{'text': 'Aldehyde (−CHO)', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Carboxyl (−COOH)', 'label': 'C'}
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: NCERT Class 10 Science, Ch 4 "Carbon and its Compounds", §4.2.4_
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