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(A) Diastereomers are stereoisomers that are not mirror images of each other. In option $(A)$,the addition of $HBr$ to $3$-methylpent-$1$-ene follows

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(A) Diastereomers are stereoisomers that are not mirror images of each other. In option $(A)$,the addition of $HBr$ to $3$-methylpent-$1$-ene follows Markownikoff's rule. The carbocation intermediate formed at the $C_2$ position is chiral. The bromide ion can attack from either the top or bottom face of the planar carbocation,leading to the formation of two new chiral centers. Since the molecule already has one chiral center,the resulting products are a pair of diastereomers. In options $(B)$,$(C)$,and $(D)$,the reactions are stereospecific or do not create a new chiral center in a way that generates a mixture of diastereomers from the existing chiral center.

Among the following reactions,a mixture of diastereomers is produced from

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