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(A) The reaction of $1$-methyl$-1-$vinylcyclopentane with $HBr$ proceeds via an electrophilic addition mechanism. $1$. The $H^+$ ion from $HBr$ attack

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$1-$bromo$-1-$methylcyclohexane

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(A) The reaction of $1$-methyl$-1-$vinylcyclopentane with $HBr$ proceeds via an electrophilic addition mechanism. $1$. The $H^+$ ion from $HBr$ attacks the double bond to form a more stable carbocation. $2$. The initial carbocation formed is a secondary carbocation on the side chain. $3$. To increase stability,the five-membered ring undergoes ring expansion to form a more stable six-membered ring carbocation. $4$. Finally,the $Br^-$ ion attacks the carbocation to form $1$-bromo$-1-$methylcyclohexane as the major product.

Product $(A)$ is

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