Chemistry - CHEMICAL BONDING Question with Solution | TestHub

Electro negativity differences$\mathrm{M}-\mathrm{C}\mathrm{l}$bond decreases as we move from$\mathrm{L}\mathrm{i}\to \mathrm{B}\mathrm{e}\to \mathrm{B}\to \mathrm{C}$and therefore, covalent character increase in the order 'C'.
Covalent nature$\propto$charge on ion.
On moving left to right across the period covalent nature increases so the order is$\mathrm{L}\mathrm{i}\mathrm{C}\mathrm{l}<\mathrm{B}\mathrm{e}\mathrm{C}{\mathrm{l}}_2<\mathrm{B}\mathrm{C}{\mathrm{l}}_3<\mathrm{C}\mathrm{C}{\mathrm{l}}_4$.