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(D) The reaction is an electrophilic addition of $D-Cl$ to $1-methylcyclopentene$. First,the electrophile $D^+$ attacks the double bond to form the mo

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(D) The reaction is an electrophilic addition of $D-Cl$ to $1-methylcyclopentene$. First,the electrophile $D^+$ attacks the double bond to form the more stable tertiary carbocation. The $D^+$ adds to the $CH$ group (the carbon with more hydrogens) to form a tertiary carbocation at the carbon bearing the $CH_3$ group. Then,the nucleophile $Cl^-$ attacks the planar carbocation from either the top or bottom face,resulting in a racemic mixture of $1-chloro-1-methyl-2-deuteriocyclopentane$ (where $D$ and $CH_3$ are trans or cis). Based on the options provided,the structure representing the addition of $D$ and $Cl$ across the double bond is the correct product.

The major product of the following reaction is $-$

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