The absolute value of the electron gain enthalpy of halogens satisfies:

The electron gain enthalpy (electron affinity) of halogens measures the energy released when a neutral atom gains an electron. Among the halogens, the general trend is that electron gain enthalpy becomes less negative as we go down the group due to increasing atomic size.

However, fluorine is an exception. Despite being the smallest halogen, fluorine has a smaller electron gain enthalpy (in absolute value) than chlorine. This is because fluorine's very small size leads to strong electron-electron repulsion in the compact 2p orbitals, making it less favorable to add an electron compared to chlorine.

The correct order of absolute values of electron gain enthalpy is: $$Cl > F > Br > I$$. The approximate values are: Cl ($$-349$$ kJ/mol), F ($$-328$$ kJ/mol), Br ($$-325$$ kJ/mol), and I ($$-295$$ kJ/mol).

This matches option (C): $$Cl > F > Br > I$$.