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(B) The reaction of a Grignard reagent $(R-MgBr)$ with $D_2O$ is a standard method for the deuteration of alkanes. In this reaction,the nucleophilic c

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$3-$methylcyclohexane with a deuterium atom at the $1$-position

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(B) The reaction of a Grignard reagent $(R-MgBr)$ with $D_2O$ is a standard method for the deuteration of alkanes. In this reaction,the nucleophilic carbon atom of the Grignard reagent attacks the deuterium atom of $D_2O$,replacing the $MgBr$ group with a deuterium atom $(D)$. The starting material is $3$-methylcyclohexylmagnesium bromide. Upon treatment with $D_2O$,the $MgBr$ group at the $1$-position is replaced by $D$. Thus,the product $(A)$ is $1$-deuterio$-3-$methylcyclohexane.

Product $(A)$ is

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