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Indemnity4 t1_j5hlhek wrote

> C2 alone isn’t possible

Sure it is, in the gas phase! Diatomic carbon is represented as :C=C:. To get deeper into MO, it exists in both singlet and triple forms.

What is a little bit more complicated is quadruple bonded carbon. It does appear it can have a forth order bond to another carbon atom (tetravalent), but it is in the form of a pi-bond and two sigma-bonds.

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