What would be the major product(s)of the following reaction?

Question

Quizplus · Accepted Answer

The reactant is an alkene undergoing halogenation with Br2/CCl4. This is a typical electrophilic addition reaction. The Br2 molecule adds across the double bond to form a bromonium ion intermediate. In this case, the intermediate is not symmetrical, which means that the bromine addition is not equally likely on both ends of the double bond. Therefore, the major product will be the one obtained by addition at the more substituted carbon because it is more stable. At the same time, there will be a smaller amount of the product obtained by addition at the less substituted carbon (usually called the anti-Markovnikov product), but this will be the minor product. In this case, choice A is the only possible product that corresponds to the more substituted carbon addition, so it is the major product. The other choices are either the less substituted carbon addition or the trans isomer of the major product, but these are less stable, so they are not the major products.

What Would Be the Major Product(s)of the Following Reaction