Question

Which of the following possess the least covalent character?

• A. $LiCl$
• B. $NaCl$
• C. $KCl$
• D. $CsCl$

Answer 1

The correct option is D $CsCl$

Among the chlorides of alkali metal, $CsCl$ has minimum covalent character as the $C{s}^{+}$ cation is largest in size and hes least polarization power. According to Fajan's rule, small cation, large anion and high charge value are favourable conditions for covalent character.