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This account presents author's opinion on the mechanism of the H-abstractionfrom methane by the [FeO](2+) group. In the course of reaction with hydrogen,the Fe-O bond in the ferryl configuration becomes elongated causing transfer ofthe spin-up electron from one of doubly occupied bonding orbitals leavingbehind single spin-down electron on oxygen. This oxygen in so-formed oxylconfiguration of the [FeO](2+) moiety then easily accept the spin-up hydrogenatom from methane in the same way as the radical-localized oxygen does. Thismechanism is compared with the scheme in which the hydrogen is accepted bylow-lying unoccupied antibonding orbital in the ferryl configuration.

Electron configuration of the [FeO](2+) group in the H-abstraction from methane: oxyl versus ferryl