下列说法中错误的是
①化学性质相似的有机物是同系物
②分子组成相差一个或几个CH2原子团的有机物是同系物
③若烃中碳、氢元素的质量分数相同，它们必定是同系物
④互为同分异构体的两种有机物的物理性质有差别，但化学性质必定相似
⑤分子式为C3H6与C6H12的两种有机物一定互为同系物
⑥互为同系物的有机物其相对分子质量数值一定相差14 n（n为正整数）
| A．只有①②③④ | B．只有①②③④⑤ |
| C．只有②③④ | D．只有①②③ |
相关试题
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| A．as a result of | B．on top of | C．in front of | D．in need of |
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| A．other | B．others | C．one | D．ones ks |
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| A．continued | B．immediate | C．careful | D．general |
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| A．as | B．if | C．though | D．unless |
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