Which of the following is not the correct arrangement according to the 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 (with negative sign)
D. `LiltNaltKltRb` : Increasing metallic radius

Answer

B

Explanation

`BltCltNltO`, When we move from B to O in a periodic table the first ionisation enthalpy increases due to the attraction of nucleus towards the outermost electron and I.E. of `NgtO`.