Why cyclohexene formed colorless solution in bromine water?
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Cyclohexene forms a colorless solution in bromine water because the addition of bromine to cyclohexene results in a slower reaction that is second-order in bromine, leading to the formation of a product with a negative overall activation energy . The addition of bromine chloride, prepared in situ from N-bromosuccinimide and hydrogen chloride, to alkyl cyclohexenes also leads to the formation of mixtures of isomeric trans-bromochloroalkylcyclohexanes . The addition of XBr (X=CCl3, CHBr2, CH2CO2Me, or PhCH2) to cyclohexene in the presence of benzoyl peroxide (BP) or Fe(CO)5+DMF results in the formation of a product of the addition of the Br and PhCO2 radicals, along with the expected adduct . The coulometric titration of cyclohexene with bromine is also described, which is appropriate for an introductory course . The spectrophotometric study of the reaction shows the presence of ionic intermediates .
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