NEET | 2016Mole ConceptHard

Question

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

Options

A.

I2 > Br2 > Cl2 > F2

B.

Cl2 > Br2 > F2 > I2

C.

Br2 > I2 > F2 > Cl2

D.

F2 > Cl2 > Br2 > I2

Solution

Decreasing order of Bond energy, Cl2 > Br2 > F2 > I2
The reason is anomalous behavior due to large electron - electron repulsion among the lone pairs in F2 molecule other than Cl2 and Br2.

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