First slide
Molecular Orbital Theory
Question

Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?

Moderate
Solution

Be2(8):KKσ(2s)2σ*(2s)2

O2(16):KKσ(2s2)σ*(2s2)σ(2pz)2π(2px)2π(2py)2π*(2px)1π*(2py)1

N2(14):KKσ(2s)2σ*(2s)2π(2px)2π(2py)2σ(2pz)2

C2(12):KKσ(2s)2σ*(2s)2π(2px)2π(2py)2

Therefore, C2 contains 2π bonds as it has 4 electrons in two pi-molecular orbitals

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