JEE MAIN - Chemistry (2021 - 17th March Morning Shift - No. 1)
The absolute value of the electron gain enthalpy of halogens satisfies :
Cl > Br > F > I
Cl > F > Br > I
I > Br > Cl > F
F > Cl > Br > I
Explanation
The magnitude of electron gain enthalpy of halogen
atoms down the group show abnormal behavior.
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.
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