Which compound has the lowest melting point?

$A$ metal,$M$,forms chlorides in its $+2$ and $+4$ oxidation states. Which of the following statements about these chlorides is correct?

Given that $Na^{+}$ ion and $S^{2-}$ ion are larger than $Cl^{-}$ ion,which of the following will be least soluble in water?

Assertion $(A)$: Covalent character follows $NaCl < MgCl_2 < BeCl_2 < LiCl$.
Reason $(R)$: According to Fajan's rules,covalent character of ionic compounds increases with decrease in size of cation.

Which one is the highest melting halide?

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