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(D) Step $1$: The conversion of benzene diazonium chloride $(C_6H_5N_2^+Cl^-)$ to benzonitrile $(C_6H_5CN)$ is a Sandmeyer reaction,which uses $CuCN \

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$CuCN \mid KCN ; C_6H_5COCH_3$

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(D) Step $1$: The conversion of benzene diazonium chloride $(C_6H_5N_2^+Cl^-)$ to benzonitrile $(C_6H_5CN)$ is a Sandmeyer reaction,which uses $CuCN \mid KCN$ as the reagent $X$. Step $2$: The reaction of benzonitrile with a Grignard reagent $(CH_3MgBr)$ followed by acid hydrolysis $(H_2O)$ is a standard method to prepare ketones. Step $3$: The mechanism involves the nucleophilic attack of $CH_3^-$ on the nitrile carbon to form an imine intermediate,which upon hydrolysis yields acetophenone $(C_6H_5COCH_3)$. Therefore,$X = CuCN \mid KCN$ and $Y = C_6H_5COCH_3$.

What are $X$ and $Y$ in the following reaction sequence ?
$C_6H_5N_2^+Cl^{-}$ $\xrightarrow{X} C_6H_5CN$ $\xrightarrow[\text{(ii) } H_2O]{\text{(i) } CH_3MgBr} Y$

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What are $X$ and $Y$ in the following reaction sequence ?$C_6H_5N_2^+Cl^{-}$ $\xrightarrow{X} C_6H_5CN$ $\xrightarrow[\text{(ii) } H_2O]{\text{(i) } CH_3MgBr} Y$