C4H6

The molecular formula C4H6 (molar mass: 54.09 g/mol) may refer to:


 * 1,3-Butadiene
 * 1,2-Butadiene
 * Bicyclobutane
 * Cyclobutene
 * Dimethylacetylene (2-butyne)
 * 1-Methylcyclopropene
 * 3-Methylcyclopropene
 * Methylenecyclopropane
 * Trimethylenemethane
 * 1-butyne