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Question

Chemistry Question on Chemical bonding and molecular structure

The correct sequence of increasing covalent character is represented by

A

LiCl<NaCl<BeCl2 LiCl < NaCl < BeCl_{2}

B

BeCl2<NaCl<LiClBeCl_{2}< NaCl < LiCl

C

NaCl<LiCl<BeCl2NaCl < LiCl < BeCl_{2}

D

BeCl2<LiCl<NaClBeCl_{2} < LiCl < NaCl

Answer

NaCl<LiCl<BeCl2NaCl < LiCl < BeCl_{2}

Explanation

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 ∝1 size of cation \propto \frac{1}{\text { size of cation }}
Covalent character ∝\propto Polarising power
So the correct order is
NaCl<LiCl<BeCl2NaCl < LiCl < BeCl _{2}
(( The order of size of cation Na+>Li+>Be2+)\left.Na ^{+}> Li ^{+}> Be ^{2+}\right)