Which of the following bond has highest bond energy?

F-F

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Cl-Cl

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Br-Br

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I-I

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Solution

The correct option is A Cl-Cl
The bond dissociation energy of fluorine is however, lower than chlorine and bromine due to its small size its inter electronic repulsion is very high. That's why the the bond dissociation enthalpy follows the order $C l_{2} > B r_{2} . F_{2} > I_{2}$ .
$I_{2}$ has the smallest bond dissociation energy due to largest size.
Hence, the correct option is B.

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