Which purification technique is used for high boiling organic liquid compounds that decompose near their boiling point?

$A$ mixture of three compounds $A, B, C$ is passed through a column of $Al_2O_3$ by using alcohol as eluant. The order in which they are eluted out of the column is $C, B, A$. Which of the following statements is true?

Which one of the following methods is suitable to separate a mixture of $n$-pentane and toluene?

Which two organic compounds are purified by the sublimation technique?

$A$ liquid compound $(x)$ can be purified by steam distillation only if it is

State True or False for the following statements:
$(i)$ The volatile liquid is purified by fractional distillation or simple distillation.
$(ii)$ Two liquids are separated by fractional distillation.
$(iii)$ Liquids with a small difference in boiling points are separated by fractional distillation.
$(iv)$ Liquids with a large difference in boiling points are separated by fractional distillation.