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  4. The correct sequence of increasing covalent character is represented by

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Q. The correct sequence of increasing covalent character is represented by

JIPMERJIPMER 2007Chemical Bonding and Molecular Structure

Solution:

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 $\left.Na ^{+}> Li ^{+}> Be ^{2+}\right)$