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DescriptionCarbenes.svg
English: Carbenes of different electron configurations and geometrical shapes.
Left: Singulet carbene. The central carbon is sp2-configured. Two sp2 orbitals are involved in covalent bonds with the two substituents. Both electrons occupy the third sp2 orbital and the remaining p-orbital is not occupied. This is the typical shape of carbenes with substituents that have a free electron pair adjacent to the central carbon, for instance :CCl2. Center: Triplet carbene, bent. The central carbon is again sp2-configured, but the two additional electrons occupy both the third sp2 orbital and the remaining p-orbital. This is the typical shape of carbenes with substituents lacking free electron pairs. Examples are :CH2 and :CHPh.
Right: Triplet carbene, straight. The central carbon is sp-configured, resulting in a straight geometry (like in alkynes). The two free electrons occupy the two degenerate p-orbitals. This form is less common than the bent variants.
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