Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is
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a
F> Cl> Br> I
b
F
c
FBr>I
d
FI
answer is C.
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Detailed Solution
(Electron gain enthalpy) =-328 -349-325-295This irregular trend is due to small size of F-atom in comparison to other halogens. The extra added electron experiences more force of repulsion in F-atom.