Chemistry Question on Chemical bonding and molecular structure

Question

Which one of the following is not paramagnetic?

Answer 1

Solution

Paramagnetic character is shown by those atoms or molecules which have unpaired electrons.
In the given compounds CO is not paramagnetic since, it does not have unpaired electrons.
The configuration of CO molecule is
$CO(14) = \sigma 1s^2, _{\sigma}^{*}1s^2 , \sigma 2s^2 ,_{\sigma}^{*}2s^2 , \sigma 2 P_x^2 ,$
$\hspace36mm$ $\pi 2 p_y^2 \approx \pi 2 p_z^2$