希夫(Schiff)试剂、托伦(Tollen)试剂、斐林(Fehling)试剂和本尼迪克(Benedict)试剂是鉴定醛基常用的四种试剂。在现行的有机化学教科书中都有介绍。但对它们各自的适用范围却很少作较为系统的说明,有的习题解答的编者甚至将它们的适用范围扩大,把它们均作为鉴定醛基的标准试剂。这显然是与一些实验事实不相符的。本文试图通过部分实验事实澄清一些模 Schiff reagents, Tollen reagents, Fehling reagents and Benedict reagents are the four most commonly used reagents for the determination of aldehyde groups. In the current organic chemistry textbooks are introduced. However, their respective scope of application is seldom systematically described. Some of them even expanded their scope of application and used them as standard reagents for the determination of aldehyde groups. This is obviously inconsistent with some experimental facts. This article attempts to clarify some modules by some experimental facts