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

Options

A. `F gt C1 gt Br gt I`
B. `F gt C1 lt Br gt I`
C. `F lt C1 gt Br I`
D. ` F lt C1 lt Be lt I`

Answer

C

Explanation

As we move from C1 to I the electron gain enthalpy (i.e., energy in electron gain ) becomes less and less negative due to a corresponding increases in the atomic size . However the electron gain enthalpy of F is less negative than that of C1 due to its small size .Thus , the negative electron gain enthalpy follows the order `: F lt C1 gt Br gt I` i.e., option ( c) is correct.