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(D) The reaction of a nitrile $(-CN)$ with a Grignard reagent $(PhMgBr)$ followed by acid hydrolysis $(H_3O^+)$ is a standard method for the preparati

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(D) The reaction of a nitrile $(-CN)$ with a Grignard reagent $(PhMgBr)$ followed by acid hydrolysis $(H_3O^+)$ is a standard method for the preparation of ketones. $1$. The nucleophilic phenyl group $(Ph^-)$ from $PhMgBr$ attacks the electrophilic carbon of the nitrile group $(-CN)$ to form an imine magnesium salt intermediate. $2$. Subsequent acid hydrolysis $(H_3O^+)$ converts the imine intermediate into a ketone $(C=O)$. $3$. The other substituent on the benzene ring,$-	ext{CH}(	ext{CH}_3)	ext{OCH}_3$,remains unaffected by these reagents. $4$. Therefore,the final product $X$ is a ketone where the $-CN$ group is replaced by a $-COC_6H_5$ group,while the side chain $-	ext{CH}(	ext{CH}_3)	ext{OCH}_3$ remains unchanged.

The structure of $X$ is :

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