Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

Question

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?, I 2 > B r 2 > C l 2 > F 2, C l 2 > B r 2 > F 2 > I 2, B r 2 > I 2 > F 2 > C l 2, F 2 > C l 2 > B r 2 > I 2

MARKS App · Accepted Answer

Decreasing order of Bond energy, C l 2 > B r 2 > F 2 > I 2 The reason is anomalous behavior due to large electron - electron repulsion among the lone pairs in F 2 molecule other than C l 2 and B r 2 .

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