The electrically neutral species H2C: and its derivatives, in which the carbon is covalently bonded to two univalent groups of any kind or a divalent group and bears two nonbonding electrons, which may be spin-paired (singlstate) or spin-non-paired (triplstate). Subclasses of carbenes include acyl carbenes , imidoyl carbenes, and vinyl carbenes., elektriliselt neutraalne rühm H2C: ja selle derivaadid, kus süsinik on kovalentselt seotud kahe ühevalentse rühmaga