Questions  

The electron gain enthalpies of halogen are as given below: F=332,Cl=349,Br=324,I=295kJmol1

The less negative for F as compared to that of Cl is due to: 

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a
strong electron-electron repulsions in the compact 2-p sub shell of F
b
strong electron-electron repulsions in the bigger 3-p sub shell of Cl
c
higher elec:tronegativity value of Cl
d
higher effective nuclear charge of F

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detailed solution

Correct option is A

Due to the short size of the F atom, the tight 2p subshell's strong electron-electron repulsions prevent the incoming electron from being taken as readily as it is with Cl (less electron-electron repulsions).
Because of this, chlorine has a greater negative electron gain enthalpy than fluorine.

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