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Q. Stephens reduction is used to prepare aldehyde from

WBJEEWBJEE 2007

Solution:

Stephens reduction
Aldehyde can prepared from alkyl cyanides, e.g.
$ C{{H}_{3}}-C\equiv N+2[H]\xrightarrow[ether]{SnC{{l}_{2}}/HCl} $
$ C{{H}_{3}}-C\underset{\downarrow {{H}_{2}}O/{{H}^{+}}}{{H=NH.HCl}}\, $
$ \underset{\text{acetaldehyde}}{{C{{H}_{3}}CHO}}\,\,+N{{H}_{4}}Cl $