Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?
Be2
O2
N2
C2
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