Question

The correct sequence of increasing covalent character is represented by

• A. $ LiCl < NaCl < BeCl_{2}$
• B. $ BeCl_{2}< NaCl < LiCl $
• C. $ NaCl < LiCl < BeCl_{2} $
• D. $ BeCl_{2} < LiCl < NaCl $

Answer 1

The Correct Option is C

On the basis of Fajan's rule, lower the size of cation higher will be its polarising power and higher will be covalent character.
$\therefore$ Polarising power $\propto \frac{1}{\text { size of cation }}$
Covalent character $\propto$ Polarising power
So the correct order is
$NaCl < LiCl < BeCl _{2}$
$($ The order of size of cation $\left.Na ^{+}> Li ^{+}> Be ^{2+}\right)$