Catalyst $S n {C l}_{2} / H C l$ is used in:

Stephen's reduction

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Cannizzaro's reaction

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Clemmensen reduction

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Rosenmund's reduction

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Solution

The correct option is C Stephen's reduction
In the Stephen's reduction alkyl cyanide is reduced to aldehyde by $S n {C l}_{2} / H C l$ .
$R - C \equiv N + 2 H S n {C l}_{2} / H C l - ------ \to R C H = N H . H C l a l i d i n e h y d r o c h l o r i d e$ $H_{2} O - - \to R C H O a l d e h y d e + {N H}_{4} C l$

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