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  4. Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :

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Q. Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to :

JEE MainJEE Main 2013The p-Block Elements - Part2

Solution:

The electron gain enthalpy order for halogens is
$CI > F > Br > I$
Due to small size of fluorine the extra electron to be added feels more electron- electron repulsion. Therefore fluorine has less value for electron affinity than chlorine.