JEE Main Chemistry question

Which of the following is an example of aldol condensation?

(A)2 CH₃COCH₃ --dil. NaOH--> (CH₃)₂C(OH)–CH₂–CO–CH₃ (diacetone alcohol)Correct
(B)2 HCHO --dil. NaOH--> CH₃OH
(C)C₆H₅CHO + HCHO --dil. NaOH--> C₆H₅CH₂OH
(D)None of the above

Answer: (A)

Solution

True aldol addition/condensation requires self- or cross-condensation between carbonyl compounds where at least one partner supplies an enolizable α-hydrogen. Acetone has α-hydrogens, so two molecules of acetone undergo base-catalyzed self-addition to give the β-hydroxy ketone diacetone alcohol,

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Question ID VK-149185