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纵观近几年高考试题.,有机物同分异构体数目的确定题型频频出现.针对这类试题,总结了一些解答方法.已知分子式确定同分异构体的数目,只需写出碳骨架,而不必把相连的氢原子全部写出;已知结构简式确定同分异构体数目,则可用箭头或用阿拉伯数字表示,而不必将其结构式一一写出;这样可以节约很多时间.如下是解答的具体方法与技巧.一.等效氢法烃的一取代物数目的确定,实质上是看处于不同位置的氢原子数目.可用“等效氢法”判断:(1)直链同一饱和碳原子上所
Throughout the college entrance examination papers in recent years, the determination of the number of isomers of organic compounds frequently occur.To solve these questions, some solutions to the problem. Known molecular formula to determine the number of isomers, just write Carbon skeleton without having to connect all the hydrogen atoms written out; the known structure concise determine the number of isomers, you can use arrows or Arabic numerals, without having to formula one by one; this can save a lot Time. The following is the answer to the specific methods and techniques. One is equivalent to determine the number of hydrogen-substituted hydrocarbon hydrocarbons, in essence, is to see the number of hydrogen atoms in different positions. Available “equivalent hydrogen method” to determine: ( 1) straight chain on the same saturated carbon atoms