Aniline is separated from a mixture by

Given below are two statements:
Statement $I$: Vapours of the liquid with higher boiling point condense before vapours of the liquid with lower boiling points in fractional distillation.
Statement $II$: The vapours rising up in the fractionating column become richer in high boiling component of the mixture.

Glycerol is purified by

Chromatography is used for the purification of which of the following?

$X$ and $Y$ have $R_f$ values of $0.75$ and $0.25$ respectively. In column chromatography,which component is obtained first?

Explain why an organic liquid vaporises at a temperature below its boiling point during steam distillation.