The reaction in which $N a C N / C_{2} H_{5} O H / H O H$ is used is :

Perkin reaction

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Benzoin condensation

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Reimer - Tieman reaction

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Rosenmunds reduction

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Solution

The correct option is B Benzoin condensation
In benzoin condensation, benzaldehyde is heated with ethanolic NaCN or KCN to form self condensation product benzoin.
$2 C_{6} H - 5 C H O K C N, w a t e r, e t h a n o l - ----------- \to C_{6} H_{5} C H O H C O C_{6} H_{5}$
Benzoin

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