CH2= CH2 + HBr ——–> CH2= CH2 + ……………——->CH3-CH2-OH CH3 – CH = CH2 + HBr ——–> CH2= CH2 + KMnO4 + H20 ——->

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1. CH₂=CH₂ + HBr → CH2Br−CH3
   CH₂=CH₂ + H2O → CH3−CH2−OH

   CH3−CH=CH2+ HBr → CH3-CHBr-CH3

   3CH₂=CH₂ + 2KMnO₄ + 4H₂O → 3CH₂(OH)CH₂OH + 2KOH + 2MnO₂

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2. Đáp án:

   $CH2=CH2 + HBr –> CH2Br−CH3$
   $CH2=CH2 + H2O –> CH3−CH2−OH$

   $CH3−CH=CH2+ HBr –> CH3-CHBr-CH3$

   $3CH2=CH2 + 2KMnO4 + 4H2O –> 3CH2(OH)CH2OH + 2KOH + 2MnO2$

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