下列物质的沸点由高到低排列顺序正确的是    (    )①正戊烷 

下列物质的沸点由高到低排列顺序正确的是    (    )

①正戊烷  ②丁烷  ③2一甲基丙烷  ④2,2-二甲基丙烷  ⑤2-甲基丁烷

A.①>②>③>④>⑤                      B.①>⑤>④>②>③

C.④>⑤>①>③>②                       D.①>⑤>③>②>④

答案

解析:烃中随碳原子数的增加,物质的熔沸点升高,戊烷>丁烷,相同碳原子数的烃支链越多,沸点越低。所以B项正确。

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