In which of the following ionixation processes , the bond order has increased and the magnetic behaviour has changed ?

Options

A. `C_(2) to C_(2)^(+)`
B. `NO to NO^(+)`
C. `O_(2) to O_(2)^(+)`
D. `N_(2 to N_(2)^(+)`

Answer

B

Explanation

`NO to NO^(+)`
`NO^(+)`, total electrons `=14 sigma 1 s^(2), overset(**) sigma 1s^(2), sigma 2s^(2), overset(**) sigma2s^(2), p 2p_(x)^(2) ~~ pi 2p_(y)^(2), sigma 2p_(z)^(2)`
`:.` Dimagnetic
Bond order `=(10-4)/(2)=3`
NO, total electrons =15
`sigma 1s^(2), overset(**) sigma 2s^(2), overset(**) sigma 2s^(2), sigma 2p_(z)^(2), pi 2p_(x)^(2)`
`= pi 2p_(y)^(2) overset(**) pi 2p_(x)^(1)`
`:.` Paramagnetic bond order `=(10-5)/(2)=(5)/(2)=25`
Electron is takne away non-bonding molecular orbital, that's why bond order increases.