Question

Alkyl cyanides when react with Grignard reagent, the product on hydrolysis found is
A. Aldehyde
B. Ketone
C. Alcohol
D. Acid

Answer 1

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Complete Step by Step Answer:
Grignard reagent has two parts. In the Grignard reagent the alkyl part acts as a nucleophile that is electron efficient species and wants to donate its electrons. In this reaction in the first step the alkyl part of the Grignard reagent attacks the carbon atom of the alkyl cyanide and the metal part of the Grignard reagent that is magnesium part connects with the nitrogen atom of cyanide.

In the next step water attacks the carbon atom and makes ketone along with ammonia as a side product. The reaction can be given as follows:


Thus we can write that Alkyl cyanides when react with Grignard reagent, the product on hydrolysis found is ketone.
Thus the correct option is B.

Note: Grignard reagent is alkyl or aryl magnesium halide type of compound. In Grignard reagent the alkyl or aryl part acts as a nucleophile and the metal part gets positive charge. Grignard reagents can convert aldehyde and ketone to alcohol. It can also convert acid to alcohol. In these Grignard reagents the metal that is magnesium acts as a hard species.