Single Choice

Which of the following species is not paramagnetic ?

A$$CO$$
Correct Answer
B$$O_{2}$$
C$$B_{2}$$
D$$NO$$

Solution

$$\displaystyle CO $$ is not paramagnetic. It is diamagnetic as all electrons are paired.
The MO electronic configuration of $$\displaystyle CO$$ is $$\displaystyle KK (\sigma 2s)^2 (\sigma *2s)^2 (\sigma 2px)^2 (\pi 2py)^2 (\pi 2pz)^2$$
Hence, the option (A) is the correct answer.

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