To separate different fractions of crude oil in the petroleum industry,the method used is:

Match List-$I$ with List-$II$:

List-$I$ (Separation of)	List-$II$ (Separation Technique)
$A$. Aniline from aniline$-water$ mixture	$I$. Simple distillation
$B$. Glycerol from spent$-lye$ in soap industry	$II$. Fractional distillation
$C$. Different fractions of crude oil in petroleum industry	$III$. Distillation at reduced pressure
$D$. Chloroform$-Aniline$ mixture	$IV$. Steam distillation

Choose the correct answer from the options given below:

Which method is used to separate glycerol from spent lye in the soap industry?

The purification method based on the following physical transformation is $:$
$\text{Solid} (X)$ $\xrightarrow{\text{Heat}} \text{Vapour} (X)$ $\xrightarrow{\text{Cool}} \text{Solid} (X)$

Explain distillation under reduced pressure.

Which technique among the following is most appropriate for the separation of a mixture of $100 \ mg$ of $p-$nitrophenol and picric acid?