The product of the reaction is

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(D) The starting material is $2$-chlorocyclohexanone. When it reacts with the Grignard reagent $CH_3MgBr$,the nucleophilic $CH_3^-$ group attacks the

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$2,2-$dimethyltetrahydrofuran

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(D) The starting material is $2$-chlorocyclohexanone. When it reacts with the Grignard reagent $CH_3MgBr$,the nucleophilic $CH_3^-$ group attacks the carbonyl carbon to form an intermediate alkoxide. Upon hydrolysis with $H_2O$,this forms $2$-chloro-$1$-methylcyclohexanol. Under the reaction conditions,an intramolecular nucleophilic substitution occurs where the hydroxyl oxygen attacks the carbon bearing the chlorine atom,leading to the elimination of $HCl$ and the formation of a cyclic ether,$2,2$-dimethyltetrahydrofuran (or a related bicyclic structure depending on the specific ring strain). Given the options,the final product is $2,2$-dimethyltetrahydrofuran.

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