Oxidationszahlen des Kohlenstoffs -4 || -3 || -2 || -1 || 0 || +1 || +2 || +3 || +4 CH4 || CH3OHCH2OHCOOHCO2RCH3RCH2OHRCHORCOOHR2CH2R2CHOHR2COR3CHR3COHR4C prim. Alkohol || sec. Alkohol || tert. Alkohol || Methanol || Methanal || Methansäure || Aldehyd || Carbonsäure || Keton