Acid-Catalyzed Hydration of Alkenes with Practice Problems. Nitrogen and sulfur nucleophiles will give S N 2 substitution in the case of 1º and 2º-halides. Electrophilic Addition Of Hydrogen Halides To Alkenes Youtube Thus the carbonyl carbon and the three atoms attached to it lie in the same plane and the π-electron cloud is above and below this plane. . The addition of pyridine to the mixture of alcohol and thionyl chloride results in the formation of alkyl halide with inverted configuration. Products 214 to 215. A recent application is the generation of highly reactive aryl radicals which are useful arylating reagents in synthesis by photoinduced electron transfer PET from photoredox catalysts to suitable precursors followed by bond scission 8 9However the choice of aryl radical precursors is currently limited to electron-poor arenes such as diazonium 6 10 or. S N 1 S N 2 E1 or E2 the Largest Collection of Practice Prob