下列反应中属于取代反应的是  ① CH3CH=CH2+Br2CH3CHBrCH2Br② CH3CH2OHCH2

下列反应中属于取代反应的是

  ① CH3CHCH2Br2CH3CHBrCH2Br

② CH3CH2OHCH2CH2H2O

③ CH3COOHCH3CH2OHCH3COOCH2CH3H2O

④ C6H6HNO3C6H5NO2H2O

A①②       B③④      C①③        D②④

答案

B

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