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  4. In the following species, the one which is likely to be the intermediate during benzoin condensation of benzaldehyde, is

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Q. In the following species, the one which is likely to be the intermediate during benzoin condensation of benzaldehyde, is

WBJEEWBJEE 2013Aldehydes Ketones and Carboxylic Acids

Solution:

When benzaldehyde is heated with aqueous ethanolic $NaCN$ or $KCN$, it dimerises to form an $\alpha$-hydroxy ketone called benzoin, and this reaction is formed as benzoin condensation. It involves self condensation of an aromatic aldehyde in the presence of $CN ^{-}$as catalyst.
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