In which of the following arrangements , the order is not correct according to the property indicated against it:

Options

A. `Al^(3+)Mg^(2+)ltNa^(+)ltF^(-)`: Increasing ionic size
B. `BltCltNltO`: Increasing enthalpy
C. `IltBrltFltCl` : Increasing electron gain enthalpy (with negative sign)
D. `LiltNaltKltCl` : Increasing metallic radius

Answer

B

Explanation

`B lt C lt N lt O`, When we move from `B` to `O` in a periodic table the first ionisation enthalpy increase due to the attraction of nucleus towards the outer most of electorns.