A) \[F>Cl>Br>I\]
B) \[Cl>F>Br>I\]
C) \[Cl>F>I>Br\]
D) \[Br>Cl>F>I\]
Correct Answer: B
Solution :
Electron affinity gradually increases on moving down the group but due to smaller size of fluorine, the added extra electron experience strong force of repulsion, hence its electron affinity is lesser than that of chlorine. \[\therefore \]The order of electron affinity of halogens is \[\begin{align} & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Cl\,\,\,\,>\,\,\,\,\,\,\,F\,\,\,\,>\,\,\,\,\,\,\,Br\,\,\,\,\,\,\,\,>\,\,\,\,I \\ & \text{Electron}\,\text{affinity}\,\,\,\,\,\text{348}\text{.5}\,\,\,\,332.6\,\,\,324.7\,\,\,\,\,\,295.5\,\, \\ & (in\,kJ/mol) \\ \end{align}\]
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