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

Options

A. `F lt C1 lt O lt S`
B. `S lt O lt C1 lt F`
C. `O lt S lt F lt C1`
D. `C1 lt F lt S lt O`

Answer

C

Explanation

In general, the electron gain enthalpy becomes more and more negative as we move across the period and becomes less and less negative on moving down the group. `O` and `F` have unusually low negative electron gain enthalpy on account of the relatively small size leading to electron repulsion:
`C1 (-349 kJ mol^(-1)) gt F (-333) gt S (-200) gt O (-141)`