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

Options

A. `Al^(3+)ltMg^(2)ltNa^(+)ltF^(-)` (increasing ionic size)
B. `BltCltNltO` (Increasing first ionisation enthalpy)
C. `IltBrltFltCl`(increasing electron gain enthalpy)
D. `LiltNaltKltRb` (Increasing metallic radius)

Answer

B

Explanation

Ionisation enthalpy of BltC but NgtO due to half-filled orbits in N which have extra stability.Electron gain enthalpy of CigtF due to bigger size and lesser electronic repulsion.