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  4. Which one of the following orders in correct for the bond dissociation enthalpy of halogen molecules ?

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Q. Which one of the following orders in correct for the bond dissociation enthalpy of halogen molecules ?

NEETNEET 2016The p-Block Elements - Part2

Solution:

$ Cl_2 > Br_2 > F_2 > I_2 $
Bond dissociation energy of $F_2$ less than $Cl_2$ and $Br_2$ because small size of f atom result in strong lone pair repulsion.