最简式相同，但既不是同系物，又不是同分异构体的是：A．辛烯和3-

最简式相同，但既不是同系物，又不是同分异构体的是：

A．辛烯和3-甲基-1-丁烯 B．苯和乙炔

C．1-氯丙烷和2-氯丙烷 D．甲基环己烷和1,3-丁二烯

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