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Q.
Which one of the following halogens has the highest bond dissociation energy?
VMMC MedicalVMMC Medical 2010
Solution:
As the size increases bond length increases, thus bond dissociation energy decreases. Molecule Bond dissociation energy $ {{F}_{2}} $ 158.8 $ C{{l}_{2}} $ 242.6 $ B{{r}_{2}} $ 192.8 $ {{I}_{2}} $ 151.1 However, the dissociation energy of fluorine is less because of its small size. Hence, $ \text{C}{{\text{l}}_{\text{2}}} $ has the highest bond dissociation energy