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# Which of the following compounds does not under go aldol condensation?

$\begin{array}{1 1}(a)\;C_6H_5CH_2CHO&(b)\;C_6H_5CHO\\(c)\;CH_3COCH_3&(d)\;\text{All}\end{array}$

Benzaldehyde does not under go aldol condensation because it does not have alpha hydrogens.
Hence (b) is the correct answer.