Acetylene
C₂H₂·26.038 g/mol·Organic·CID 6326
IndustrialFuel
The simplest alkyne with a C≡C triple bond and linear geometry. Burns at ~3,300°C in oxyacetylene welding torches. Historically used for lighting (carbide lamps). Key building block in organic synthesis.
IUPAC: acetylene
Also known as: Ethyne, Narcylen, Ethine, Acetylen, Vinylene (+14 more)
Molecular Structure
Molecular Propertiesmass · H-bonds · stereo
Molecular Weight
26.040g/mol
Exact Mass
26.015650Da
Monoisotopic Mass
26.015650Da
XLogP
0.4
Polar Surface Area
0.0Ų
Complexity
8
Formal Charge
0
H-Bond Donors
0
H-Bond Acceptors
0
Rotatable Bonds
0
Heavy Atoms
2
Stereo Centers
0
Bond Stereo
0
Drug-Likeness (Lipinski's Rule of Five)
✓ 26.0 g/mol
MW ≤ 500
✓ 0.4
LogP ≤ 5
✓ 0
H-bond donors ≤ 5
✓ 0
H-bond acceptors ≤ 10
Passes all rules — good oral bioavailability predicted
GHS Hazard Classification
Danger
Hazards
H220Extremely flammable gasH280Contains gas under pressure; may explode if heatedH336May cause drowsiness or dizziness
Source: PubChem GHS Classification. Always consult the SDS for handling.
Constituent Elements
Isomers8 compounds with formula C₂H₂
1,2-dideuterioethyne
CID 136829 · 28.1 g/mol
deuterioethyne
CID 137497 · 27.0 g/mol
(1,2-13C2)ethyne
CID 10877042 · 28.0 g/mol
CID 6432236
CID 6432236 · 26.0 g/mol
1,2-ditritioethyne
CID 12198473 · 30.1 g/mol
(111C)ethyne
CID 450700 · 25.0 g/mol
(114C)ethyne
CID 12198470 · 28.0 g/mol
(113C)ethyne
CID 12198471 · 27.0 g/mol