Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is: (i) f > cl > br > i (ii) f < cl < br < i (iii) f < cl > br > i (iv) f < cl < br < i

The correct answer is f < cl > br > i.

Electron gain enthalpy is defined as the amount of energy released when an electron is added to an isolated gaseous atom. Due to electron-electron repulsion in a small-sized F atom, the electron gain enthalpy of F is less negative than that of CI. As we move down the group, electron gain enthalpy becomes less negative due to increase in atomic size.

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