Which of the following order is not correct ?

Options

A. `IE(I)` of `Be gt IE(I)` of `B` but `IE(II)` of `Be lt IE(II)` of `B`
B. `IE(I)` of `Be lt IE(I)` of `B` but `IE(II)` of `Be lt IE(II)` of `B`
C. `IE(II)` of `O gt IE(II)` of `N`
D. `IE(I)` of `Mg gt IE(I)` of `Al`

Answer

2

Explanation

`Be=1s^(2)2s^(2),B=1s^(2)2s^(2)2p^(1)`
`IE(I)BegtIE(I)B` because of the removal of electron from stable electronic configuration, `2s^(2)` and `s-` subshell electron also has higher penetration power in case of `Be`.