Ncert Exercises & Solutions

Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is:

1.	F > Cl > Br > I	2.	F < Cl < Br < I
3.	F < Cl > Br > I	4.	F < Cl < Br > I

HINT: Generally down the group electron gain enthalpy decreases.

Explanation:

As we move from Cl to I, the electron gain enthalpy (i.e., energy released in electron gain) become 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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