The major product of the reaction is:

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(B) The reaction of an alkene with bromine $(Br_2)$ in the presence of $CCl_4$ is a classic electrophilic addition reaction. This reaction proceeds vi

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$1,2$-dibromo-$^{82}$-$1$-bromocyclohexane

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(B) The reaction of an alkene with bromine $(Br_2)$ in the presence of $CCl_4$ is a classic electrophilic addition reaction. This reaction proceeds via the formation of a cyclic bromonium ion intermediate. The bromide ion $(Br^-)$ then attacks the cyclic bromonium ion from the side opposite to the bromonium bridge, which results in anti-addition. Given the reactant is $1$-bromocyclohexene and the reagent is $^{82}Br-^{82}Br$, the anti-addition of the two $^{82}Br$ atoms across the double bond leads to the formation of $1$-bromo-$1,2$-bis$(^{82}Br)$cyclohexane with the bromine atoms in a trans configuration.

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