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List the methods to Test to distinguish aldehydes and ketone

List the methods to Test to distinguish aldehydes and ketones.

1 Answer

Tollen’s test: When an aldehyde is heated with Tollen’s reagent it forms silver mirror.  Tollen’s reagent is ammoniacal solution of AgNO3.

Ketones do not form silver mirror and hence do not give this test

Fehling’s test: When an aldehyde is heated with Fehling’s reagent it forms reddish brown precipitates  of cuprous oxide. Fehling’s reagent: Fehling solution A (aqueous solution of CuSO4) + Fehling solution B (alkaline solution of sodium potassium tartarate)

Ketones do not give this test

answered Jul 19 by pady_1
edited Jul 19 by meena.p
 
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