Using Grignard reagent, suggest synthesis of following alcohol from aldehyde or ketone. Whenever possible, suggest more than one combination.

The aldehydes which will not form Grignard product with one equivalent of Grignard reagents are
$\left(\mathrm{A}\right)$

$\left(\mathrm{B}\right)$

$\left(\mathrm{C}\right)$

$\left(\mathrm{D}\right)$

The product $\left(\mathrm{R}\right)$ of the following reaction sequence is

 the reactant $\mathrm{A}$ is:

Consider the following sequence of reactions.

 $\mathrm{Z}\stackrel{{\mathrm{PCl}}_5}{\to }\mathrm{X}\stackrel{\mathrm{Alc}.\mathrm{KOH}}{\to }\mathrm{Y}\underset{2{\mathrm{H}}_2\mathrm{O}/\mathrm{\Delta }}{\overset{\mathrm{Conc}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\mathrm{Z}$

$\text{'}\mathrm{Z}\text{'}$ is

cannot be prepared by:

Write the structures of the main products in the following reactions:

In the following reaction sequence: 

Compound $\mathrm{I}$ is