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Q.
Which of the following has the highest bond energy ?
The p-Block Elements - Part2
Solution:
Bond energy of Fluorine (although $F_2$ has smallest bond length) is lesser than $Cl_2$ and $Br_2$ due to greater interelectronic repulsions between the lone pair of electrons on F atom.
Halogen F - F Cl - Cl Br - Br I - I
Bond dissociation 38 57 45.5 35.5
energy (kcal/mol)
So chlorine has highest bond energy.