question_answer

Acetophenone when reacted with a base, \[{{C}_{2}}{{H}_{5}}ONa,\] yields a stable compound which has the structure [AIPMT (S) 2008]

A)

B)

C)

D)

Correct Answer: B

Solution :

[b] Key Idea: Aldehydes or ketones with \[\alpha -H\] atom, in presence of dilute base, undergoes aldol condensation to give \[\beta \]-hydroxy aldehyde or \[\text{ }\!\!\beta\!\!\text{ -}\]hydroxy ketone. On heating, aldols eliminate, water molecule to form \[\alpha \text{, }\!\!\beta\!\!\text{ -}\]unsaturated compound.

Note: When aldehydes condense with ketones, it is the a-H of ketone which takes part in condensation. This reaction is called crossed aldol condensation.