一、问题的提出在讲《乙烯》这节内容时,教师一定会讲到乙烯区别于甲烷的两个非常重要的化学性质,一是乙烯能使酸性高锰酸钾溶液褪色,二是乙烯能使溴水褪色,同时一定会强调前者的褪色是乙烯发生了氧化反应,后者的褪色是乙烯发生了加成反应,这两个反应褪色的原理是不一样的。可有些细心的学生却有自己的想 First, the question put forward in the “ethylene” in this section, teachers will talk about ethylene is different from the two very important chemical properties of methane, first, ethylene acid potassium permanganate solution fade, the second is ethylene Brominated water will fade, at the same time it will certainly emphasize the former fade is ethylene oxidation reaction, the latter fade is ethylene addition reaction occurs, the two reaction fading principle is not the same. Some attentive students have their own thoughts