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Q.
Which of the following is formed, when benzaldehyde reacts with alcoholic $KCN$ ?
Aldehydes Ketones and Carboxylic Acids
Solution:
$ \underset{\text{Benzaldehyde }}{2 C _{6} H _{5} CHO} \xrightarrow{\text{alc}. KCN} C _{6} H _{5} \underset{\text{Benzoin}}{CH ( OH )} COC _{6} H _{5}$
Thus in this reaction benzoin is formed. The reaction is known as benzoin condensation.