Chemistry - Thermochemistry Question with Solution | TestHub

Normally electron gain enthalpy increases with electro negativity but chlorine has higher electron gain enthalpy than fluorine (exception) due easier addition of electron in Cl as in F addition of electron is tough due to more electronic density based electronic repulsion.
$\mathrm{C}\mathrm{l}>\mathrm{F}>\mathrm{B}\mathrm{r}>\mathrm{I}$(Electron affinity order)