In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

- Option A is wrong: Nitrogen has a stable half-filled configuration ($2p^3$), so its first ionization enthalpy is higher than Oxygen ($2p^4$). Correct order: $\text{B}<\text{C}<\text{O}<\text{N}$.Option B is also technically wrong: Fluorine has a lower electron gain enthalpy than Chlorine due to inter-electronic repulsions in its small size. Correct order: $\text{I}<\text{Br}<\text{F}<\text{Cl}$.(NEET Phase 1 source marks both as discrepancies, but A is the more standard 'incorrect' trend usually tested).