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Which one of the following orders is cor...

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

A

`Cl_(2) gt Br_(2) gt F_(2) ge I_(2)`

B

`Br_(2) gt I_(2) gt F_(2) gt Cl_(2)`

C

`F_(2) gt Cl_(2) gt Br_(2) gt I_(2)`

D

`I_(2) gt Br_(2) gt Cl_(2) gt F_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
As the size increases, bond disociation enthalpy becomes lower. Also, as the size of atoms get smaller, ion pairs on two atoms get close enough together is experience repulsion. In case of `F_(2)`. This repulsion is bigger and bond becomes weaker.
Hence the correct order is `Cl_(2) gt Br_(2) gt F_(2) gt I_(2)`.
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