Acetylene

Acetylene is a hydrocarbon, belonging to the alkyne group. It is the simplest type of alkyne, as it has only two hydrogen atoms and two carbon atoms. Acetylene is an unsaturated organic compound because its four atoms are triple bonded through a covalent bond. It was discovered in 1836 by Edmund Davy. The chemical symbol is C₂H₂.

Acetylene
General
Molecular formula	C2H2
SMILES	C#C
Molar mass	26.038 g/mol
Appearance	colorless gas
Properties
Density and phase	1.1772 kg/m³ at 15 °C, gas
Solubility in water	slightly soluble
Melting point	−80°C (192.3 K, -113.4 °F)
Boiling point	−84 °C (189.6 K, -119.2 °F)
Structure
Symmetry group	D∞h
Dipole moment	Zero

80% of all acetylene produced yearly in the United States is used for chemical synthesis. It is a toxic chemical; breathing the substance causes dizziness, headache and nausea.