Glycerol boils at $290\,^{\circ}C$ with slight decomposition. Impure glycerine can be purified by

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

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

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:

Which substance is used in the purification of bone charcoal?

If a liquid compound decomposes at its boiling point,which method$(s)$ can you choose for its purification? It is known that the compound is stable at low pressure,steam volatile,and insoluble in water.