Which metal halide is insoluble in water?

To a mixture of $LiCl$,$AlCl_3$ and $NaCl$,ether is added. Which of these will be extracted into ether?

Among the following,the maximum covalent character is shown by the compound:

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A :$ Lithium halides are somewhat covalent in nature.
Reason $R :$ Lithium possesses high polarization capability.
In the light of the above statements,choose the most appropriate answer from the options given below:

If the ionic character of $Na^{+}$ and $S^{2-}$ ions is greater than that of $Mg^{2+}$ and $Cl^{-}$ ions,which of the following will be the least soluble in water?

Highest covalent character is found in which of the following?