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(C) The reaction of a nitrile $(CH_3CH_2CN)$ with a Grignard reagent $(CH_3MgBr)$ followed by acidic hydrolysis $(H_3O^+)$ is a standard method for th

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$CH_3CH_2COCH_3$

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(C) The reaction of a nitrile $(CH_3CH_2CN)$ with a Grignard reagent $(CH_3MgBr)$ followed by acidic hydrolysis $(H_3O^+)$ is a standard method for the preparation of ketones.Step $1$: The nucleophilic methyl group from $CH_3MgBr$ attacks the electrophilic carbon of the nitrile group to form an imine salt intermediate $(CH_3CH_2C(NMgBr)CH_3)$.Step $2$: Acidic hydrolysis of the imine salt converts it into a ketone $(CH_3CH_2COCH_3)$.Therefore,the major final product is butan-$2$-one $(CH_3CH_2COCH_3)$.

The major final product in the following reaction is $CH_3CH_2CN \xrightarrow[(ii) \ H_3O^{+}]{(i) \ CH_3MgBr}$

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