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Byju's Answer
Standard XII
Chemistry
Oxidation Number Method
R - C ≡ N+2H ...
Question

R−C≡N+2H(i)SnCl2/dil.HCl−−−−−−−−−−−→(ii)H3O+RCHO+NH4Cl, this reaction is known as:

A
Etard reaction
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B
Stephen reaction
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C
Hell-Volhard-Zelinsky reaction
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D
Balz - Schiemann reaction
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Solution

The correct option is B Stephen reaction
Synthesis of aldehydes(R-CHO) from nitriles(R-CN) using tin chloride and dil.HCl in acidic medium is called stephen's reaction. In this reaction iminium salt is produced as a intermediate.
StephenSyn.png

So, option B is correct.


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