$X$ in the above reaction is

The major product of the following reaction is:

$Ph-CH=C(CH_3)_2 \xleftarrow{HBr} A$ and $Ph-CH=C(CH_3)_2 \xrightarrow[\text{Peroxide}]{HBr} B$. Identify $A$ and $B$.

$But-1-ene$ reacts with diborane to give '$X$'. On oxidation of '$X$' with $H_2O_2$ in the presence of aqueous $NaOH$,it forms alcohol '$Y$'. What are '$X$' and '$Y$'?

What is the structure of the $2$-butenyl radical?

What is the product formed when isobutylene reacts with $HOCl$?