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(A) Diastereomers are stereoisomers that are not mirror images of each other.In the reaction of $3$-methylpent-$1$-ene with $HBr$ (electrophilic addit

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(A) Diastereomers are stereoisomers that are not mirror images of each other.In the reaction of $3$-methylpent-$1$-ene with $HBr$ (electrophilic addition),the $H^+$ adds to the terminal carbon to form a carbocation at the $C_2$ position. This carbocation is planar. The $Br^-$ ion can attack from either side of the planar carbocation. Since the molecule already contains a chiral center at the $C_3$ position,the formation of a new chiral center at the $C_2$ position results in two products that have different configurations at the new chiral center but the same configuration at the original chiral center. These are diastereomers.

Which of the following reactions results in the formation of a pair of diastereomers?

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