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Polarisability and Fajan's Rule

C-Cl bond is ...

Question

$C - C l$ bond is stronger than $C - I$ bond, because:

C - C l

bond is more ionic than

C - I

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C - C l

bond is polar covalent bond

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C - C l

bond is more covalent than

C - I

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C - C l

bond length is longer than

C - I

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Solution

The correct option is A $C - C l$ bond is more ionic than $C - I$
(i) $C - C l$ bond length is shorter than $C - I$ bond length because chlorine atom is smaller in size as compared to iodine atom.
(ii) $C - C l$ bond is more ionic than $C - I$ bond because of greater difference in electronegativities of $C$ and $C l$ as compared to that of carbon and iodine.
(iii) More ionic character of bond, more will be its strength.
$∴ C - C l$ bond is stronger than $C - I$ bond because $C - C l$ bond is more ionic than $C - I$ .

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