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分析近年高考试题,不难发现同分异构体的考查出现率几乎已达100%,此类试题能很好的考查考生空间想象能力和结构式书写能力,故而备受高考出题者的青睐。但对于多数考生而言,要做到快速、准确地解决此类问题却是一个难点。笔者结合多年的教学经验,发现按物质类别采用相应方法书写,更利于学生理解、掌握并灵活应用,可大大提高此类题目的正确率。一、明确书写同分异构体必须遵循的原理“价键数守恒”原理:在有机物分子中碳
Analysis of college entrance examination papers in recent years, is not difficult to find that the occurrence rate of isomers almost reached 100%, such questions can be a good test candidates space imagination and structural writing skills, and therefore highly favored college entrance examination questions. However, for most candidates, it is a difficult task to solve such problems quickly and accurately. The author combines many years of teaching experience and found that the corresponding method of writing by substance category, more conducive to students to understand, master and flexible application, can greatly improve the accuracy of such topics. First, a clear written isomers must follow the principle of “price key number conservation” principle: in the organic molecules carbon