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In the following species, the one which is likely to be the intermediate during benzoin condensation of benzaldehyde is
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- D
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When benzaldehyde is heated with aqueous ethanolic NaCN or $\mathrm{KCN},$ 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 $\mathrm{CN}^{-}$ as catalyst.
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