When propylene reacts with hydrogen bromide in the presence of a peroxide initiator, which of the following structures are formed during the mechanism?

A)
B)
C)
D) H∙

The mechanism for the reaction of propylene with hydrogen bromide in the presence of a peroxide initiator involves the formation of a free radical intermediate. The correct structure formed during the mechanism is , which shows the free radical intermediate where the bromine has added to the carbon with the most hydrogen atoms. The other structures listed are not involved in the mechanism. H∙ is a hydrogen radical and is not a product of this reaction.