Which one of the following species is diamagnetic with a bond order of two ?

A
C₂
B
Be₂
C
N₂
D
B₂

Solution:

$\begin{array}{l} C_{2} . . KK {(σ_{2 s})}^{2} {(σ_{2 s}^{*})}^{2} {(π_{2 p_{z}})}^{2} {(π_{2 p_{y}})}^{2} \\ Bond order = \frac{8 - 4}{2} = 2 \end{array}$

It is diamagnetic as it has no unpaired electrons.

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