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Q. Which of the following molecules is paramagnetic in nature?

Chemical Bonding and Molecular Structure

Solution:

$B_{2}$ molecule has the following configuration:
$\left(\sigma 1s^{2}\right)\left(\sigma^* 1s^{2}\right)\left(\sigma 2s^{2}\right)\left(\sigma^* 2s^{2}\right) \left(\pi 2p_{x}^{1} = \pi2p_{y}^{1}\right) $