下列说法中不正确的是    A.各组成元素质量分数相同的烃是同一

下列说法中不正确的是

    A.各组成元素质量分数相同的烃是同一种烃

    B.结构相似,组成上相差一个或若干个CH2原子团的有机物是同系物

    C.分子式相同而结构式不同的有机物一定是同分异构体

DC3H6C4H8不一定是同系物

答案

A

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