NEET | 2016Mole ConceptEasy
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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