Four-carbon molecules are based on a skeleton made from four carbon atoms. They may be in a chain, branched chains, cycles or even bicyclic compounds

C4H4 isomers with CAS registry numbers
Hydrocarbons that include four atoms are:
- butane C4H10
 - isobutane C4H10
 - but-1-ene C4H8
 - but-2-ene C4H8
 - but-1-yne C4H6
 - but-2-yne C4H6
 - isobutylene C4H8
 - butadiene C4H6
 - 1,2-butadiene C4H6
 - vinylacetylene C4H4
 - diacetylene C4H2
 - butatriene C4H4
 - cyclobutane C4H8
 - cyclobutene C4H6
 - cyclobutyne C4H4
 - cyclobutadiene C4H4
 - methylenecyclopropene C4H4
 - bicyclobutane C4H6
 - 1-bicyclobutene C4H4
 - Δ1,3-bicyclobutene C4H4
 - propalene C4H2
 - methylcyclopropane C4H8
 - 1-methylcyclopropene C4H6
 - 3-methylcyclopropene C4H6
 - methylenecyclopropane C4H6
 - 3-methylcyclopropyne C4H4
 - methylenecyclopropyne C4H2
 - tetrahedrane C4H4
 
See also
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