A) \[F<Cl<Br<I\]
B) \[~Cl<F<Br<~I\]
C) \[~I<Br<Cl<F\]
D) \[~Cl<Br<I<F\text{ }\]
Correct Answer: B
Solution :
The correct order of electron gain enthalpy\[\Delta H\] (with + sign) of the halogen atom is \[Cl<F<Br<I\] The reason that fluorine has a less negative electron affinity than chlorine is relatively small size of F atom resulting in the repulsions (electron-electron) to the entering electron.
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