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Which of the following molecules/ins doe...

Which of the following molecules/ins 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
The distribution of electrons in MOs is an follows:
`N_(2)^(+) `(electrons 13) `sigma^(2)sigma^(***2)2sigma^(***2) underset(pi^(2))overset(pi^(2))(" ")sigma^(1)underset(pi^(***))overset(pi^(***))(" ")sigma^(***) " " O_(2) ` (electrons 16) `sigma^(2) sigma^(***2)sigma^(2) sigma^(***2)sigma^(2) ""_(pi^(2))^(pi^(2)) ""_(pi^(***1))^(pi^(***1))sigma^(***)`
`O_(2)^(2-)` (electrons 18) `sigma^(2) sigma^(***2)sigma^(2) sigma^(***2)sigma^(2) ""_(pi^(2))^(pi^(2)) ""_(pi^(***))^(pi^(***))sigma^(***) " " B_(2)` (electrons 10) `sigma^(2) sigma^(***2)sigma^(2) sigma^(***2) ""_(pi^(1))^(pi^(1))`
Only `O_(2)^(2-)` does not contain any unpaired electron.
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