Category : JEE Main & Advanced
Test | Aldehydes | Ketones |
With Schiff's reagent | Give pink colour. | No colour. |
With Fehling's solution | Give red precipitate. | No precipitate is formed. |
With Tollen's reagent | Black precipitate or silver mirror is formed. | No black precipitate or silver mirror is formed. |
With saturated sodium bisulphite solution in water | Crystalline compound (colourless) is formed. | Crystalline compound (colourless) is formed. |
With 2, 4-dinitrophenyl hydrazine | Orange-yellow or red well defined crystals with melting points characteristic of individual aldehydes. | Orange-yellow or red well defined crystals with melting points characteristic of individual ketones. |
With sodium hydroxide | Give brown resinous mass (formaldehyde does not give this test). | No reaction. |
With sodium nitroprusside and few drops of sodium hydroxide | A deep red colour (formaldehyde does not respond to this test). | Red colour which changes to orange. |
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