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Self-aldol condensation of acetaldehyde, after dehydration, gives
AAcetone
BCrotonaldehyde (2-butenal)
CVinyl alcohol
Dn-Butanol
Answer & Solution
Correct answer: B. Crotonaldehyde (2-butenal)
$2\,CH_3CHO \to CH_3CH(OH)CH_2CHO$ (aldol) $\to CH_3CH=CHCHO$ (crotonaldehyde) after $\beta$-elimination of water. The condensation step (dehydration) gives the $\alpha,\beta$-unsaturated carbonyl.
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