Among LiCl, BeCl₂, BCl₃ and CCl₄, the covalent bond character follows the order

LiCl < BeCl₂ < BCl₃ < CCl₄ : Covalent character order

In the above molecules,

as the magnitude of the +ve charge increases,

the polarising power of cation increases,

& hence sharing of electrons increases,

therefore covalent character increases.

Polarising power $\infty$covalent character