Methods used for purification of organic compounds are based on:

In the given $TLC$ plate,the distances of spots $A$ and $B$ from the base line are $4 \ cm$ and $6 \ cm$,respectively. The distance moved by the solvent front from the base line is $8 \ cm$. If the $R_f$ value of $B$ is $x \times 10^{-1}$ times that of $A$,find the value of $x$.

Which one of the following mixtures can be separated by steam distillation technique?

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

$A$ liquid with a high boiling point decomposes on simple distillation,but it can be steam distilled for its purification. Explain how this is possible.

The most suitable method of separation of a $1:1$ mixture of $ortho$- and $para$-nitrophenols is: