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Which molecule/ion out of the following ...

Which molecule/ion out of the following does not contain unpaired electrons?

A

`N_(2)^(+)`

B

`O_(2)`

C

`O_(2)^(2-)`

D

`B_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
M.O. energy level diagrams of the different species are :
`N_(2)^(+)KK[sigma_(2s)]^(2)[sigma_(2s)^(**)]^(2)[pi_(2px)]^(2)[pi_(2py)]^(2)[sigma_(2pz)]^(1)`
`O_(2):KK[sigma_(2s)]^(2)[sigma_(2s)^(**)]^(2)[sigma_(2pz)]^(2)[pi_(2px)]^(1)`
`[pi_(2py)]^(2)[pi_(2px)^(**)]^(1)[pi_(2y)^(**)]^(1)`
`O_(2)^(2-):KK[sigma_(2s)]^(2)[sigma_(2s)^(**)]^(2)[sigma_(2pz)]^(2)[pi_(2x)]^(2)`
`[pi_(2py)][pi_(2px)^(**)]^(2)[pi_(2py)^(**)]^(2)`
`B_(2):KK[sigma_(2s)]^(2)[sigma_(2s)^(**)]^(2)[pi_(2px)]^(1)[pi_(2py)]^(1)`
`O_(2)^(2-)` ion has no unpaired electrons.
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