Which one of the following arrangements represents the correct order of electron gain enthalpy of the given atomic species?

Options

A. `Cl lt F lt S lt O`
B. `S lt O lt Cl lt F`
C. `O lt S lt F lt Cl`
D. `F lt Cl lt O lt S`

Answer

C

Explanation

Halogens have very high electron affinity. It may be rated that the electrons affinity of fluorine is unexpectedly low `(lt Cl)`. This may perheps be due to small size of `F` atom. The value of electron gain enthalpies for `Cl, F, S` and `O` are respectively `349,333,200` and `142 kJ//mol` hence correct order is `Cl gt F gt S gt O`.