- 问题详情:42.C________(面临)withasevereeconomicdownturn,Chinaistryingtopromotereform.43.Justasaproverbgoes,ittakestwotomakeaq________.Wecan’tblamejustoneside.44.Asiswellknown,waterisc________ofhydrogenandoxygen.45.PorgyandBessisanAmericanoperar_______...
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- 问题详情:苯环上有两个侧链烃基的有机物C12H18,其同分异构体的数目为(不考虑立体异构)()A.39B.42C.45D.48【回答】【*】C【解析】根据支链共有6个碳原子,可以形成1和5、2和4、3和3,*基只有1种,戊基有8种:C-C-C-C-C:正戊*形成的戊基有3种;C-C-C(-C)2:异戊*形成的戊基有4种;C(-C)4:新戊*形...
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