Question

Among LiCl, $BeCl_{2},BCl_{3}$ and $CCl_{4}$ , the covalent bond character follows the order

• A. $LiCl < BeCl_{2}>BCl_{3}>CCl_{4}$
• B. $LiCl>BeCl_{2} < BCl_{3} < CCl_{4}$
• C. $LiCl < BeCl_{2} < BCl_{3} < CCl_{4}$
• D. $LiCl>BeCl_{2}>BCl_{3}>CCl_{4}$

Answer 1

Answer: (C)

Electro negativity differences $M-Cl$ bond decreases as we move from $Li \rightarrow Be \rightarrow B \rightarrow C$ 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 $LiCl < BeCl_{2} < BCl_{3} < CCl_{4}$ .