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  4. The ground state magnetic property of B2 and C2 molecules will be

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Q. The ground state magnetic property of $B_2$ and $C_2$ molecules will be

WBJEEWBJEE 2017Chemical Bonding and Molecular Structure

Solution:

According to molecular orbital theory, outer configuration for
$\left[ C _{2}\right]= C _{12} \rightarrow \pi p_{x}{ }^{2}=\pi p_{y}{ }^{2}$
Thus, is diamagnetic in nature.
$\left[ B _{2}\right]= B _{10}->\pi p_{x}^{1}=\pi p_{y}^{1}$
Thus, is paramagnetic in nature.