答案
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CH2==CH2+HBr―→ CH3—CH2Br
CH2==CH2+H2O―→ CH3—CH2OH
CH3—CH2—OH+HBr CH3CH2Br+H2O
CH3CH2OH CH2==CH2↑+H2O
2CH3CH2OH+O2 2CH3CHO+2H2O
CH3CH2OH