Which is the correct property mentioned `-`

Options

A. `Fe^(+) lt Fe^(2+) lt Fe^(3+)-`size
B. `Fe^(+) lt Fe^(2+) lt Fe^(3+)-`ionisation energy
C. `B lt Be lt C-`
D. `N lt O lt F-`ionisation energy

Answer

2

Explanation

`I.E.` increases on increasing `+ve` charge on species due to more Zeff.