preparation of ethene from ethyl bromide
which pathway and why?
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Preparation of ethyl bromide from ethene: Ethene (C2H6) can be converted to ethyl bromide by reaction with hydrogen bromide. This reaction is called addition of hydrogen halide to alkene (or addition hydrohalogenation reaction) where hydrogen halide acts as electrophile and attacks the C = C bond of alkene.
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It is usually prepared by the addition of HBr to ethene: H2C=CH2 + HBr → H3C-CH2Br. Bromoethane is inexpensive and would rarely be prepared in the laboratory. A laboratory synthesis includes reacting ethanol with a mixture of hydrobromic and sulfuric acids.
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