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SOLVED: 16 Alkenes are economically and chemically important families of organic compounds. (a) The reaction of alkenes with bromine water provides a test for unsaturation in the laboratory. Describe the color change when bromine water is added to chloroethene. (1) (b) Deduce the Lewis structure of chloroethene and identify the formula of the repeating unit of the polymer polychloroethene. (2) (c) Besides polymerization, state two commercial uses of the reactions of alkenes. (2) (Total 5 marks)

SOLVED: 16 Alkenes are economically and chemically important families of organic compounds. (a) The reaction of alkenes with bromine water provides a test for unsaturation in the laboratory. Describe the color change when bromine water is added to chloroethene. (1) (b) Deduce the Lewis structure of chloroethene and identify the formula of the repeating unit of the polymer polychloroethene. (2) (c) Besides polymerization, state two commercial uses of the reactions of alkenes. (2) (Total 5 marks)

已浏览 101 次2021年10月22日

brz chzclz ch3 h3c hac electrophilic addition of bromine biz to alkenes yields l2 dibromoalkane the reaction proceeds through cyclic intermediate known as bromonium ion the reaction occurs i 69715

brz chzclz ch3 h3c hac electrophilic addition of bromine biz to alkenes yields l2 dibromoalkane the reaction proceeds through cyclic intermediate known as bromonium ion the reaction occurs i 69715

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Iodine azide, IN 3, adds to alkenes by an electrophilic mechanism similar to that of bromine. If a monosubstituted alkene such as 1 -butene is used, only one product results: CH3 cH2 CH=CH2 I-N=N=N ⟶CH3 CH2 CHCH2 I (a) Add lone-pair electrons to the structure shown for IN 3, and draw a second resonance form for the molecule. (b) Calculate formal charges for the atoms in both resonance structures you drew for IN 3 in part (a). (c) In light of the result observed when IN 3 adds to 1 -butene, what

Iodine azide, IN 3, adds to alkenes by an electrophilic mechanism similar to that of bromine. If a monosubstituted alkene such as 1 -butene is used, only one product results: CH3 cH2 CH=CH2 I-N=N=N ⟶CH3 CH2 CHCH2 I (a) Add lone-pair electrons to the structure shown for IN 3, and draw a second resonance form for the molecule. (b) Calculate formal charges for the atoms in both resonance structures you drew for IN 3 in part (a). (c) In light of the result observed when IN 3 adds to 1 -butene, what

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