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

What is the difference between distillation,distillation under reduced pressure,and steam distillation?

Match List-$I$ with List-$II$.

List-$I$ (Purification technique)	List-$II$ (Mixture of organic compounds)
$(A)$ Distillation (simple)	$(I)$ Diesel + Petrol
$(B)$ Fractional distillation	$(II)$ Aniline + Water
$(C)$ Distillation under reduced pressure	$(III)$ Chloroform + Aniline
$(D)$ Steam distillation	$(IV)$ Glycerol + Spent-lye

Choose the correct answer from the options given below $:$

From the figure of column chromatography given below,identify the incorrect statements.
$A.$ Compound '$c$' is more polar than '$a$' and '$b$'
$B.$ Compound '$a$' is least polar
$C.$ Compound '$b$' comes out of the column before '$c$' and after '$a$'
$D.$ Compound '$a$' spends more time in the column
Choose the correct answer from the options given below :-

Glycerol is purified by

Suggest a method for the purification of camphor contaminated with salt.