试题与答案

The criminal _____ fire to a store and a

题型:选择题

题目:

The criminal _____ fire to a store and after a moment the whole store _____ fire. [ ]

A. made a; lit a

B. set a; caught

C. caught; was on

D. set; was on

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:根据物质的结构简式可知,A中含有3类氢原子,B中含有2类氢原子,C中4类氢原子,D中2类氢原子,所以一氯取代物种数最多的是C,答案选C。点评:有机物中等效氢原子的判断一般方法是同一个碳原子上...

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