The best and latest technique for isolation,purification and separation of organic compounds is:

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$:
Assertion $(A):$ $A$ simple distillation can be used to separate a mixture of propanol and propanone.
Reason $(R):$ Two liquids with a difference of more than $20^{\circ}C$ in their boiling points can be separated by simple distillation.
In the light of the above statements,choose the most appropriate answer from the options given below:

$p-$nitrophenol and $o-$nitrophenol are separated by

Explain the sublimation technique used for the purification of organic compounds.

In an aniline and water mixture,aniline can be separated by:

Thin-layer chromatography is an example of