Which one of the following halogens has the highest bond energy ?
A. `F_2`
B. `Cl_2`
C. `Br_2`
D. `I_2`
A. `F_2`
B. `Cl_2`
C. `Br_2`
D. `I_2`
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Correct Answer – B
Shorter the bond, stronger the bond, more its bond dissociation energy. However bond dissociation energy of `Cl_2` is more than `F_2`. This is despite the fact that F-F bond is shorter than Cl-Cl bond. Correct order of bond energies is `Cl_2 gt Br_2 gt F_ 2 gt I_2`