The absolute value of the electron gain enthalpy of halogens satisfies:
A
Cl>Br>F>I
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B
I>Br>Cl>F
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C
F>Cl>Br>I
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D
Cl>F>Br>I
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Solution
The correct option is DCl>F>Br>I The magnitude of electron gain enthalpy of halogen atoms down the group shows abnormal behaviour. The |ΔHeg| of F is lower than that of Cl due to its smaller size. The incoming electron experiences higher repulsive force due to valence electrons of F than Cl. The correct order is Cl>F>Br>I
Option d is the correct answer.