What is a chromatogram?

The distillation technique most suited for separating glycerol from spent-lye in the soap industry is:

Match column $-I$ and column $-II$ with the correct relation:

Column $-I$	Column $-II$
$(i)$ Liquid boiled at low temperature	$(a)$ Fractional distillation
$(ii)$ Glycerol from lye	$(b)$ Simple distillation
$(iii)$ The liquid with lower boiling point condenses first	$(c)$ Steam distillation
$(iv)$ The liquid with higher boiling point condenses first	$(d)$ Distillation under reduced pressure

Give the answer of the following questions in short:
$(i)$ When is simple distillation used?
$(ii)$ When is fractional distillation used?
$(iii)$ Which liquid is obtained first in fractional distillation?
$(iv)$ Which liquid is cooled first in fractional distillation?
$(v)$ What happens in the fractional column?

Give a brief description of the principles of the following techniques taking an example in each case.
$(a)$ Crystallisation
$(b)$ Distillation
$(c)$ Chromatography

Match items of Column-$I$ and Column-$II$.

Column-$I$ (Mixture of compounds)	Column-$II$ (Separation Technique)
$A$. $H_2O / CH_2Cl_2$	$I$. Crystallization
$B$. $\alpha$-tetralone / $p$-nitrophenol	$II$. Differential solvent extraction
$C$. Kerosene / Naphthalene	$III$. Column chromatography
$D$. $C_6H_{12}O_6 / NaCl$	$IV$. Fractional Distillation

Correct match is: