Isopropyl alcohol is obtained by reacting which of the following alkenes with conc. $H_2SO_4$ and $H_2O$?

Rank the following alkenes in order of decreasing heats of hydrogenation (largest first):
$1$. $1-$butene
$2$. $2-$methyl$-2-$butene
$3$. trans$-2-$butene
$4$. cis$-2-$butene

The chemical reaction is shown below:
$C_6H_5-CH_2-CH=CH_2 + HCl \rightarrow X$,$X$ is:

The major product $(A)$ is:

The major product of the reaction is:

Identify $X$ and $Y$ in the following reaction sequence: $X$ $\xrightarrow{Zn} Y$ $\xrightarrow[Zn, H_2O]{O_3} (CH_3)_2CO + CH_2O$