Gasoline is obtained from crude petroleum oil by its

How do you perform the purification of the following?
$(i)$ The boiling point of liquid $X$ is $450 \ K$ and it decomposes at $400 \ K$ temperature.
$(ii)$ Mixture of $60 \% \ \text{Camphor}$ and $40 \% \ BaSO_4$.

The correct match between items of List-$I$ and List-$II$ is:

List-$I$	List-$II$
$A$. Coloured impurity	$P$. Steam distillation
$B$. Mixture of $o$-nitrophenol and $p$-nitrophenol	$Q$. Fractional distillation
$C$. Crude oil	$R$. Charcoal treatment
$D$. Mixture of glycerol and sugars	$S$. Distillation under reduced pressure

Glycerol boils at $290\,^oC$ with slight decomposition. Impure glycerin can be purified by:

Which substance is used in the purification of bone charcoal?

Given below are two statements:
Statement-$I$: Retardation factor $(R_f)$ can be measured in $meter/centimeter$.
Statement-$II$: $R_f$ value of a compound remains constant in all solvents.
Choose the most appropriate answer from the options given below: