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Functional group of aldehyde:

A–COOH
B–OH
C–C=O–C
D–CHO (carbonyl with H attached)
Answer & Solution
Correct answer: D. –CHO (carbonyl with H attached)
**Aldehyde:** –CHO. Carbon of carbonyl is bonded to ≥1 H. e.g., HCHO (formaldehyde), CH₃CHO (acetaldehyde).
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