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Q.
$C-C l$ bond is stronger than $C-I$ bond, because
NTA AbhyasNTA Abhyas 2020Chemical Bonding and Molecular Structure
Solution:
$C$ - $Cl$ bond is more ionic than $C - I$ bond because of the greater difference in electronegativities of $C$ and $C l$ as compared to that of carbon and iodine. Therefore, $C - Cl$ bond is stronger than $C - I$ bond.