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What is Stephen's reaction? Give the che...

 What is Stephen's reaction? Give the chemical equation of the reaction.

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Reduction of nitrites with acidified stannous chloride `(SnCl_(2)//con.HCl)` at room temperature gives aldehydes. In the first step imine hydrochloride is obtained which on hydrolysis with boiled water gives aldehyde.
`R-CN+2[H] overset(SnCI_(2)+con.HCI) to R -CH= NH.HCI overset(H_(3)O^(+)) to  R-CHO+ NH_(4)CI `
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