Cyanogen is a colourless gas, (CN)2 with a pungent odour. The compound is very toxic. It my be prepared in the laboratory by heating mercury (II) cyanide.
Citing this page:
Generalic, Eni. "Cyanogen." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.