Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy ) is
(a) F > Cl > Br > I (b) F < Cl < Br < I (c) F < Cl > Br > I (d) F < Cl < Br < I

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Solution

Answer: (c) F < Cl > Br > I

As we move from Cl to I the electron gain enthalpy (i.e. energy released in electron gain) becomes less and less negative due to a corresponding increase in the atomic size.
However, the electron gain enthalpy of F is less negative than that of Cl due to its small size. Thus, the negative electron gain enthalpy follows the order
F < Cl > Br > I.

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I^{-}, B r^{-}, C l^{-}, F^{-}

F_{2} > C l_{2} > B r_{2} > I_{2}

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