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

Options

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

Answer

B, C

Explanation

(b) `B lt C lt N lt O` (given I.P. order)
`B lt C lt O lt N` (correct)
(c) `I lt Br lt l lt F `(given `Delta H_(eg)` order)
`I lt Br lt F lt Cl` (correct)