First slide

Covalent Bonding

Question

Among LiCl , BeCl₂, BCl₃ and CCl₄, the covalent bond character varies as

Moderate

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

$LiCl > {BeCl}_{2} > {BCl}_{3} > {CCl}_{4}$

Solution

Apply Fajans' rule. (Higher the charge, more the covalent.)
$\overset{\oplus}{LiCl} < \overset{+ 2}{{BeCl}_{2}} < \overset{+ 3}{{BCl}_{3}} < \overset{+ 4}{{CCl}_{4}}$ polarising power of +ve species $\infty \frac{c o v a l e n t c h a r a c t e r}{i o n i c c h a r a c t e r}$

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