A compound containing a carbon–carbon triple bond. A terminal alkyne has a hydrogen directly attached to one of its sp carbons.
An anion formed by removing the terminal proton of an alkyne, . It can act as a carbon nucleophile, for example in addition to a ketone.
The hydrocarbon . Its triple-bond fragments are linear, but the entire carbon skeleton need not be. The extended anti conformation has an inversion centre at the central bond midpoint and belongs to the C2h molecular point group.
The simplest aryne, . Its extra in-plane bonding interaction is distinct from the out-of-plane aromatic pi system.
, a terminal alkyne.

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