Identify the product 'B' obtained in following reaction R - C N [HCl] SnCl_2 A H_3O^+ B

MHT CET 2024 Chemistry question

Identify the product 'B' obtained in following reaction

R{-}C{≡}N A B

(1)R-NH
(2)R-CONH
(3)R-CHOCorrect
(4)R-COOH

Answer: (3)

Solution

This is the Stephen reaction. An alkyl or aryl cyanide is reduced by stannous chloride in the presence of HCl to the imine hydrochloride (aldimine salt), (A) (formed via ). Hydrolysis of the imine salt with then gives the aldehyde:

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Question ID VK-095627