What is the correct order of `2^(nd)` ionisation energy ?

Options

A. `F lt N lt C lt O`
B. `N lt C lt F lt O`
C. `C lt N lt F lt O`
D. `O lt C lt F lt N`

Answer

B

Explanation

What is the correct order …………..
After removal of one electron :
`{:(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)):}`
Remioval of second electron will requie maximum energy in case of O because of its half filed electronic configuration after removal of one electron.
`:.` increaseing order of 2nd ionisation enthalpy : `C lt N lt F lt O`