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一、葡萄糖与果糖的比较1.葡萄糖与果糖的相似性(1)均为无色晶体,均有甜味,均易溶于水。(2)分子式均为C_6H_(12)O_6,均属于单糖。(3)均具有还原性(尽管果糖分子中没有醛基,但在碱性条件下果糖的分子结构能够发生变化,酮基转化为醛基,因而果糖也具有还原性),均属还原性糖,均能与银氨溶液反应产生银镜,均能与新制Cu(OH)_2悬浊液反应产生Cu_2O砖红色沉淀。因此,不能用银氨溶液或新制Cu(OH)_2悬
First, the comparison of glucose and fructose 1. Glucose and fructose similarity (1) are colorless crystals, are sweet, are soluble in water. (2) Molecular formula is C_6H_ (12) O_6, all belong to monosaccharide. (3) are all reducible (although there is no aldehyde group in the fructose molecule, the molecular structure of the fructose can be changed under alkaline conditions, and the keto group is converted to the aldehyde group, so the fructose also has a reducing property) , Can react with silver ammonia solution to produce silver mirror, which can react with new Cu (OH) _2 suspension to produce Cu_2O brick red precipitate. Therefore, silver ammonia solution can not be used or new Cu (OH) _2 suspension