The electrophilic addition of Bromine () to an alkene proceeds via which type of intermediate, resulting in what stereochemistry?

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Question

The electrophilic addition of Bromine ($Br_2/CCl_4$) to an alkene proceeds via which type of intermediate, resulting in what stereochemistry?

Prashant Kotian · Accepted Answer

Correct answer: B. Halogens add via a bridged three-membered cyclic halonium ion. The subsequent attack by the halide must occur from the opposite face, forcing strict anti-addition.

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