The correct order of second ionisation potential of C, N, O and F is:

Options

A. `O gt N gt F gt C`
B. `O gt F gt N gtC`
C. `F gt O gt N gtC`
D. `C gt N gt O gt F`

Answer

B

Explanation

The second ionization potenital means removal of electron from cation
`C^(+)=1s^(2)2s^(2)2p^(1)`,`N^(+)=1s^(2)2s^(2)2p^(2)`
`O^(+)=1s^(2)2s^(2)2p^(3)`, `F^(+)=1s^(2)2s^(2)2p^(4)`
Therefore `O gt F gt N gt C`