$I.$ $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CHOH}-\mathrm{CH}_{3}$ -$2-$Hexanol
$II.$ $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}\left(\mathrm{CH}_{3}\right)-\mathrm{CHOH}-\mathrm{CH}_{3}$-$3-$ Methyl$-2-$pentanol
$III.$ $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{2}-\mathrm{CHOH}-\mathrm{CH}_{3}$$4-$methyl$-2-$pentanol
$IV.$ $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{CHOH}-\mathrm{CH}_{3}$$3,3$ - Dimethyl$-2-$butanol
પ્રકિયાના ક્રમમાં $X$ અને $Y$ અનુક્રમે શું હશે ?

$\left. \begin{gathered}
(A)\,\,\xrightarrow{{PB{r_3}}}\,(C)\,\xrightarrow{{Mg\,,\,ether}}Grignard\,\,reagent \hfill \\
(A)\,\,\xrightarrow[{{H_2}S{O_4}}]{{N{a_2}C{r_2}{O_7}}}\,(B) \hfill \\
\end{gathered} \right\}$ $ \to \,(D)\xrightarrow{{{H_3}{O^ \oplus }}}$ $(3,4-$ ડાયમિથાઇલ $3-$ હેકઝાનોલ l$)$