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Which functional group is represented by the condensed formula -COOH?
ACarboxylic acid
BAldehyde group
CAlcohol group
DKetone group
Answer & Solution
Correct answer: A. Carboxylic acid
1. In -COOH a carbon is double-bonded to one oxygen and single-bonded to an -OH.
2. This C(=O)-OH combination is the carboxylic acid functional group.
3. Rule out B: an aldehyde is -CHO, where the carbonyl carbon holds a hydrogen, not -OH.
4. Rule out C: an alcohol is just -OH, with no C=O present.
5. Rule out D: a ketone is -CO- flanked by two carbons, with no -OH.
6. Only carboxylic acid has both the C=O and the -OH on the same carbon.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 9 "Carbon Compounds", p.127_
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