The compound $\mathrm{A}$ on treatment with $\mathrm{Na}$ gives$\mathrm{B}$ and with ${\mathrm{PCl}}_5$ gives $\mathrm{C}$. $\mathrm{B}$ and $\mathrm{C}$ react together to give diethyl ether. $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are in the order

Identify the major products $\mathrm{P}, \mathrm{Q}$ and $\mathrm{R}$ in the following sequence of reactions:

AIIMS 2018

Product of the above reaction is

Product of reaction is:-  AIIMS 2018

AIIMS 2018

The most suitable method of separation of  $1:1$ mixture of ortho and para-nitrophenols is _____.