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  4. R- CN xrightarrow[ text (ii) H 3 O +] text (i) SnCl 2+ HCl R- CHO What is the name of the above reaction?

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Q. $R- CN \xrightarrow[{\text { (ii) } H _{3} O ^{+}}]{\text { (i) } SnCl _{2}+ HCl } R- CHO$
What is the name of the above reaction?

TS EAMCET 2016

Solution:

Specifically, when reduction is carried out with $SnCl _{2} / HCl$. It is called Stephen's reaction. The generalised reaction looks like

image