Thank you for reporting, we will resolve it shortly
Q.
Which one of the following is not paramagnetic?
Bihar CECEBihar CECE 2012Chemical Bonding and Molecular Structure
Solution:
Paramagnetic character is shown by those atoms or molecules which have unpaired electrons.
In the given molecules CO is not paramagnetic, since, it does not have unpaired electrons. The configuration of $CO$ molecule is
$CO(14)=\sigma 1{{s}^{2}},\,\overset{*}{\sigma}1s^{2},\,\sigma 2s^{2},\,\overset{*}{\sigma }2s^{2},\,\pi 2p_{x}^{2} \approx$
$\pi 2p_{y}^{2},\sigma 2p_{z}^{2}$