Which of the following compounds has the least ionic character?

Amongst the following species,maximum covalent character is exhibited by

The correct order of covalent bond character of $BCl_3, CCl_4, BeCl_2, LiCl$ is

Which of the following statements are correct?
$(A)$ Both $LiCl$ and $MgCl_2$ are soluble in ethanol.
$(B)$ The oxides $Li_2O$ and $MgO$ combine with excess of oxygen to give superoxide.
$(C)$ $LiF$ is less soluble in water than other alkali metal fluorides.
$(D)$ $Li_2O$ is more soluble in water than other alkali metal oxides.
Choose the most appropriate answer from the options given below.

Amongst $LiCl$,$RbCl$,$BeCl_2$,and $MgCl_2$,the compounds with the greatest and the least ionic character,respectively,are:

The polarising ability of which one of the following is highest?