Sun February 22, 2009 By:

explain fehling's test and tollen's test of carbonyl compounds

Expert Reply
Wed February 25, 2009

The oxidation of aldehydes can be performed with a mild oxidizing agent, such as Ag+  in
ammonia solution used in the Tollens test or Cu2+  in alkaline solution used in Fehling's test.  If
the Tollens test is performed in a scrupulously clean glass vessel, the silver metal is plated on the
walls of the glass to form a silver mirror.  Fehling's reagent is a deep blue Cu2+  solution that
forms a brick-red precipitate of Cu2O in the presence of aldehydes.

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