| IUPAC name
| Other names
|3D model (Jmol)||Interactive image|
|Molar mass||54.091 g/mol|
|Density||0.6783 g cm−3|
|Melting point||−125.7 °C (−194.3 °F; 147.5 K)|
|Boiling point||8.08 °C (46.54 °F; 281.23 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|(what is ?)|
1-Butyne, also known as ethylacetylene, but-1-yne, ethylethyne, and UN 2452, is an extremely flammable and reactive alkyne with chemical formula C4H6 and CAS number 107-00-6 that is used in the synthesis of organic compounds. It occurs as a colorless gas.