A

David

Darling

cyanogen (C2H2)

cyanogen molecule

Cyanogen molecule, showing bond lengths.


Cyanogen (C2H2) is a colorless, toxic gas, a pseudohalogen, prepared by oxidizing a cyanide. It is reactive and polymerizes (see polymerization) to paracyanogen. Melting point -27.9°C, boiling point -21.2°C.