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  Definition of axes: x is perpendicular to (Ned.: loodrecht op) the plane of molecule, y is in the direction of the C-C bond. (show/hide)
Questions on C2H4, ethene, ethylene:

Which occupied MO's are bonding w.r.t. the C-C bond?
Which ones are anti-bonding?
Which carbon 2p orbitals contribute to MO 3?
Which MO's only have contributions from 2px orbitals?