Choose the correct statement regarding Fajan's rule.

In the case of alkali metal halides,the covalent character decreases in the order:

Given below are two statements:
Statement $I$: The correct order in terms of bond dissociation enthalpy is $Cl_{2} > Br_{2} > F_{2} > I_{2}$.
Statement $II$: The correct trend in the covalent character of the metal halides is $[SnCl_{4} > SnCl_{2}]$, $[PbCl_{4} > PbCl_{2}]$ and $[UF_{4} > UF_{6}]$.
In the light of the above statements, choose the correct answer from the options given below:

The correct increasing order of polarising power is

Assertion $(A)$: $LiCl$ and $MgCl_2$ are soluble in ethanol.
Reason $(R)$: Lithium and magnesium are harder than their respective group elements.

Which of the following compounds volatilises on heating?