The above transformation can be carried out by:

The correct match about the reaction sequence shown above is:

Match the reaction in Column-$I$ with the mechanism in Column-$II$.

Column-$I$ (Reaction)	Column-$II$ (Mechanism)
$A$. $CH_3OCH_2CH_3 + HI \to CH_3I + CH_3CH_2OH$	$i$. $S_{E}2$ Aromatic
$B$. $(CH_3)_3COCH_3 + HI \to CH_3OH + (CH_3)_3CI$	$ii$. $S_{N}1$
$C$. $C_6H_5OCH_3 + Br_2(CH_3COOH) \to p$-Bromoanisole	$iii$. Elimination $(\beta)$
$D$. $CH_3CH_2OH + H_2SO_4 (443 \ K) \to CH_2=CH_2$	$iv$. $S_{N}2$

Identify product $B$ in the following reaction sequence:
$(CH_3)_2C=C(CH_3)_2$ $\xrightarrow{X_2, H_2O} A$ $\xrightarrow{OH^{-}} B$

An alcohol $X \left( C_5 H_{12} O \right)$ produces turbidity instantly with conc. $HCl / ZnCl_2$. Isomer $(Y)$ of $X$ undergoes dehydration with conc. $H_2 SO_4$ at $443 \ K$. $X$ and $Y$ respectively are

The number of possible isomers of the compound with molecular formula $C_7H_8O$ is