Appropreate reagent to distinguish a acyteldehyde from keton is
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Home >> CBSE XII >> Chemistry >> Aldehydes, Ketones and Carboxylic Acids
List the methods to Test to distinguish aldehydes and ketone
List the methods to Test to distinguish aldehydes and ketones.
cbse class 12 chemistry alcohols aldehydesketones and carboxylic acids theory question
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asked Jul 19, 2017 by pady_1
edited Aug 3, 2017 by meena.p

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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
ASK
Home >> CBSE XII >> Chemistry >> Aldehydes, Ketones and Carboxylic Acids
List the methods to Test to distinguish aldehydes and ketone
List the methods to Test to distinguish aldehydes and ketones.
cbse class 12 chemistry alcohols aldehydesketones and carboxylic acids theory question
 Share
asked Jul 19, 2017 by pady_1
edited Aug 3, 2017 by meena.p

1 Answer
Need homework help? Click here.
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
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