Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O , S , F and Cl ?

Step-by-step solution

Key Idea:- Electron gain enthalpy, generally, increases in a period from left to right and decreases in a group on moving downwards. However, members of III period have somewhat higher electron gain enthalpy as compared to the corresponding members of second period, because of their small size. O and S belong to VI A (16) group and Cl and F belong to VII A (17) group. Thus, the electron gain enthalpy of Cl and F is higher as compared to O and S . Cl and F > O and S Between Cl and F , Cl has higher electron gain ent