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

Options

A. `I lt Br lt Cl lt F` (increasing electron-gain enthalpy)
B. `Li lt Na lt K lt Rb` (increasing metallic radius).
C. `Al^(3+) lt Mg^(2+) lt Na^(+) lt F^(-)` (increasing ionic size)
D. `B lt C lt N lt O` (increasing first ionisation enthalpy).

Answer

A

Explanation

The increasing order of negative electron gain enthalpy: `I lt Br lt F lt Cl` and that of first ionisation energy: `B lt C lt O lt N`.