Question
Arrange $\text{F}_2,\text{Cl}_2,\text{Br}_2,\text{I}_2$ in increasing order of bond dissociation enthalpy?
✓
Answer
$\text{I}_2<\text{F}_2<\text{Br}_2<\text{Cl}_2.\text{F}_2$ has exceptionally low bond dissociation enthalpy due to repulsion between lone pair as it has smallest size among halogens.
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