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苯酚是芳烃最简单的含氧衍生物,分子里只有一个羟基与苯环上的碳原子直接相连.由于苯环的“大”与羟基的“小”,以及苯环结构的高度对称,苯环和羟基连接后在性质上表现出其特殊性,但由于课时限制不能详尽介绍,因而我们在学习时容易产生一些误区. 误区一油状苯酚的密度比水轻 苯酚晶体的密度比水重,而往往把油状液体的苯酚误认为比水轻,分层后在上层.实际上油状液态的苯酚也比水重,分层后在下层. 误区二苯酚从水溶液中析出的是晶体沉淀
Phenol is the simplest oxygen-containing derivative of an aromatic hydrocarbon. Only one hydroxyl group in the molecule is directly linked to the carbon atom on the phenyl ring. Due to the “largeness” of the benzene ring and the “small” hydroxyl, and the high symmetry of the benzene ring structure, the benzene ring The connection to the hydroxy group shows its specificity in nature, but due to the limitations of class time can not be described in detail, so we easily misunderstood in learning. Misunderstanding of the density of an oily phenol is lighter than the density of light phenol crystals than water, and often The oleaginous phenol is mistaken for lighter than water and is layered on the upper layer. In fact, the oily liquid phenol is also heavier than water, and is layered on the lower layer. Misunderstanding of diphenol precipitation from the aqueous solution is the precipitation of crystals.