In chromatography,what does $R_f$ stand for?

Give the information of the following in short.
$(i)$ Fractional column $(ii)$ Theoretical plate $(iii)$ Mechanism of fractional column.

State whether the following statements are True or False:
$(i)$ The boiling points of chloroform and aniline are $334 \ K$ and $457 \ K$ respectively.
$(ii)$ The vapour of chloroform is obtained after aniline in simple distillation.
$(iii)$ Chloroform is more volatile than aniline.

Suggest a method for the purification of camphor contaminated with salt.

Given below are two statements:
Statement-$I$: Retardation factor $(R_f)$ can be measured in $meter/centimeter$.
Statement-$II$: $R_f$ value of a compound remains constant in all solvents.
Choose the most appropriate answer from the options given below:

Which of the following is the structure of a separating funnel?