Question

40. Which can undergo Aldol condensation
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Answer 1

Explanation:

All carbonyl compounds containing α−H or α−D undergo aldol condensation.

Answer 2

The aldehydes that have alpha hydrogen atoms undergo aldol condensation reaction. Benzaldehyde lacks the alpha hydrogen, so it cannot undergo aldol condensation reaction. In all other options, there is atleast one alpha hydrogen, so they can undergo aldol condensation reaction.