Which is the best method to separate a mixture of benzoic acid and naphthalene?

$A$ mixture of sand and sulphur may best be separated by:

On the basis of which physical property does the separation of different fractions in the fractional distillation technique take place?

Separation of $Acetone$ and $Benzene$ from their mixture is carried out by

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ $A$ mixture contains benzoic acid and naphthalene. The pure benzoic acid can be separated out by the use of benzene.
Reason $R:$ Benzoic acid is soluble in hot water.
In the light of the above statements,choose the most appropriate answer from the options given below.

Give the technique for the separation of the following:
$(i)$ Mixture of sugar and sand
$(ii)$ Mixture of kerosene and water
$(iii)$ Mixture of benzene and common salt
$(iv)$ Mixture of liquids with boiling points $356 \, K$ and $365 \, K$
$(v)$ Mixture of aniline and camphor