Which of the following halogens has the highe | vedclass

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(B) Generally,bond dissociation energy decreases down the group as the atomic size increases.However,$F_2$ is an exception due to its very small atomi

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$Cl_2$

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(B) Generally,bond dissociation energy decreases down the group as the atomic size increases.However,$F_2$ is an exception due to its very small atomic size.In $F_2$,the lone pairs of electrons on the $F$ atoms are very close to each other,resulting in strong inter-electronic repulsion.This weakens the $F-F$ bond.Therefore,the order of bond dissociation energy is $Cl_2 > Br_2 > F_2 > I_2$.Thus,$Cl_2$ has the highest bond dissociation energy.

Which of the following halogens has the highest bond dissociation energy?

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