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

Which of the following statements about $TLC$ are correct?
$(i)$ Glycine is identified on $TLC$ plate due to its colour.
$(ii)$ Amino acids can be detected by spraying the $TLC$ plate with $Ninhydrin$ solution.
$(iii)$ The retardation factor $(R_f)$ is the ratio of the distance travelled by the solute to that of the solvent from the base line.
$(iv)$ Sodium chloride is commonly used as an adsorbent.

Which apparatus is used to reduce pressure in distillation under reduced pressure?

Suggest the method for the purification of naphthalene.

Identify the purification technique for the following mixtures:
$(i)$ Chloroform and aniline
$(ii)$ Impure acetone
$(iii)$ Impure aniline
$(iv)$ Chlorobenzene and bromobenzene

What is an eluant?