Alkene Oxides,Oxiranes or Epoxides [O] CH=CH2 CH2—CH2 ethylene ethylene oxide oxirane 1,2-epoxyethane Alkene Oxides, Oxiranes or Epoxides C H2 =CH2 [O] C H2 CH2 O ethylene ethylene oxide oxirane 1,2-epoxyethane