Question

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

• A. $B_2$ paramagnetic and $C_2$ diamagnetic
• B. $B_2$ diamagnetic and $C_2$ paramagnetic
• C. Both are diamagnetic
• D. Both are paramagnetic

Answer 1

Answer: (A)

$B_2$ paramagnetic and $C_2$ diamagnetic

Answer 2

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.