Among the reactions,
`F_(2(g)) + 2e^(-) to 2F_((g))^(-)` and
`Cl_(2(g)) + 2e^(-) to 2Cl_((g))^(-)` which is more feasible ? Give the reason. 

Explanation

The reaction, `F_(2)(g)+2e^(-)rarr2F^(-)(g)`, is more feasible. Formation of halide from halogen involves bond dissociation enthalpy and electron gain enthalpy. Electron gain enthalpy is more for chlorine and its bond dissociation energy is also more. Hence, it is relatively difficult to form chloride.