下列物质的沸点由高到低排列的顺序是① CH3(CH2)2CH3 ② CH3(CH2)3CH3③ (CH3)3CH④ (CH3)CHCH2CH3⑤ (CH2CH2)2CHCL A.⑤②④①③ B.④②⑤①③ C.⑤④②①③ D.②④⑤③①

问题描述:

下列物质的沸点由高到低排列的顺序是
① CH3(CH2)2CH3 ② CH3(CH2)3CH3③ (CH3)3CH④ (CH3)CHCH2CH3
⑤ (CH2CH2)2CHCL
A.⑤②④①③ B.④②⑤①③ C.⑤④②①③ D.②④⑤③①

C

a

④ 应该是(CH3)2CHCH2CH3吧,(CH3)CHCH2CH3凑不齐啊
同分异构体:链烃及其衍生物的同分异构体随着支链增多,熔沸点降低.
所以① CH3(CH2)2CH3 >③ (CH3)3CH ④ (CH3)2CHCH2CH3>② CH3(CH2)3CH3
烃、卤代烃、醇、醛、羧酸等有机物一般随着分子碳原子数增加,熔沸点升高.
所以② CH3(CH2)3CH3>① CH3(CH2)2CH3
卤代烷的沸点和密度都大于相应的烷烃
所以⑤ (CH2CH2)2CHCL > (CH2CH2)2CH2> ④ (CH3)2CHCH2CH3
所以选 C.⑤④②①③
啊,终于做完了,对不对?不对的话告诉我,让我改改.