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Explain why Bond dissociation energy of ...

Explain why Bond dissociation energy of `F_2` is less than that of `Cl_2` ?

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The interelectronic repulsions among non-bonding electrons in `F_(2)` is very high. `:underset(ddot)overset(ddot)F-underset(ddot)overset(ddot)F:` These repulsions are lesser in `Cl_(2)` molecule. This is because of the larger size of Cl- atom thar that of F - atom. `:underset(ddot)overset(ddot)F-underset(ddot)overset(ddot)F:` Hence, bond dissociation energy of `F_(2)` is less than that of `Cl_(2)`.
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