Which of the following compounds reacts with $HBr$ to form $1$-Bromo-$1$-methylcyclohexane?

Consider the following reactions:
$X + HCl \xrightarrow{\text{Anhydrous } AlCl_3} C_2H_5Cl$ (Addition)
$Y \xrightarrow{\text{Anhydrous } ZnCl_2 / HCl} C_2H_5Cl$ (Substitution)
$Y$ can be converted to $X$ on heating with $...$ at $...$ temperature:

During the debromination of $meso-2,3-dibromobutane$,the major compound formed is:

What is the product formed when $CH_3-CH=CH_2$ is treated with $B_2H_6$ followed by the action of $H_2O_2$?

The product $(P)$ is:

$CH_3-C(CH_3)=CH_2$ $\xrightarrow[R_2O_2]{HBr} X$ $\xrightarrow{CH_3ONa} Y$; $X$ and $Y$ are: