Select the correct statements about the peroxide-initiated addition of HBr to an alkene.

AThe initiation step involves homolysis of the weak $O - O$ bond of the peroxide.
B $Br \cdot$ adds to the less substituted alkene carbon so that the more stable carbon radical forms.
CThe carbon radical abstracts a hydrogen atom from HBr, regenerating $Br \cdot$ .
DA carbocation intermediate is formed when $Br \cdot$ adds to the alkene.

Answer: A, B, C

Peroxide O-O homolysis starts the chain (statement 1). In propagation,

Br \cdot

adds to the less hindered carbon to give the more stable radical (2), and this radical abstracts H from HBr to give the product and a new

Br \cdot

(3). No carbocation is involved in a radical chain, so statement 4 is wrong.