Which of the following substances is the most ionic?

Which one is least ionic in the following compounds?

What is the bonding nature in $LiCl$ bond?

Among the compounds $LiCl$,$RbCl$,$BeCl_2$,and $MgCl_2$,which compounds possess the highest and lowest ionic character,respectively?

Which of the following halides has the highest melting point?

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.