下列物质中,在一定条件下既能起加成反应,也能起取代反应,但不

下列物质中,在一定条件下既能起加成反应,也能起取代反应,但不能使KMnO4酸性溶液褪色的是( )

A. 乙烷    B.     C. 乙烯    D. 乙醇

答案

B

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