An alkyl group is fully saturated alkane (fully saturated hydrocarbon) group, with an open bond. It is normally attached as part of a larger molecule. A methyl group is the simplest alkyl group with the formula CH3. Alkyls follow the general formula CnH2n+1 for non-ringed structures, ringed arrangements are C2H2n-1. The symbol R may refer to an unspcified alkyl group.