First slide

Molecular Orbital Theory

Question

Which one of the following species is diamagnetic having a bond order one.

Moderate

A

Li₂
B

B₂
C

He₂
D

C₂

Solution

C₂ - Diamagnetic - 2
Li₂ - Diamagnetic - 1
B₂ - Paramagnetic - 1
He₂ - Does not exist.
${Li}_{2} - {(σ_{1 s})}^{2} {(σ_{1 s}^{*})}^{2} {(σ_{2 s})}^{2}; Bond order = \frac{4 - 2}{2} = 1;$

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