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Q.
Catalyst $SnCl_{2}/HCl$ is used in
ManipalManipal 2011
Solution:
In the Stephens reduction alkyl cyanide is reduced to aldehyde by
$R-C\equiv N +2H\ce{ ->[Sncl_2/HCl]} \underset{\text{alidime hydrochloride}}{RCH =NH\cdot HCl}$
$\ce{->[H_2O]}\underset{\text{aldehyde}}{RCHO}+N{{H}_{4}}Cl$