The correct order of decreasing ionic nature of lead dihalides is

Which of the following substances has the least covalent character?

Arrange the following in the decreasing order of their covalent character:
$(A)$ $LiCl$ $(B)$ $NaCl$ $(C)$ $KCl$ $(D)$ $CsCl$
Choose the most appropriate answer from the options given below.

The number of the following factors which affect the percent covalent character of the ionic bond is $............$.
$(a)$ Polarising power of cation
$(b)$ Extent of distortion of anion
$(c)$ Polarisability of the anion
$(d)$ Polarising power of anion

According to Fajan's rule,covalent bond is favoured by

Which ion exhibits the maximum Lewis acid character?