3 - Methyl - pent - 2 - ene on reaction with HBr   in presence of peroxide forms an addition product.…

In the presence of peroxide anti-Markownikoff's product form.

${\mathrm{E}}^{⨁}\mathrm{ }$ attacks $\mathrm{C}-$where hindrance is less.

$2$ chiral centres are present in the product.

Number of stereoisomers $\left(2^{\mathrm{n}}\right)=2^2=4$.