Question

3-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for 'A' is ______.

Answer 1

The structure of the product formed will have two chiral centers due to anti-Markovnikov addition of HBr in the presence of peroxide:
With two chiral centers, the number of stereoisomers is:

$2^{\text{chiral centers}} = 2^2 = 4$