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Tests for Aldehydes

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Estimated time: 3 minutes
CBSE: Class 12

Key Points: Tests for Aldehydes

Test Reagent Observation Inference
Schiff's Reagent test Dilute solution of rosaniline hydrochloride (pink discharged by SO₂) Violet/pink (magenta) colour within 2 minutes Aldehyde present
Tollen's Reagent [Ag(NH₃)₂]OH (ammoniacal AgNO₃) Silver mirror / black precipitate Aldehyde present
Fehling's Solution test CuSO₄ + alkaline sodium potassium tartrate Red–brown crystals of Cu₂O Aldehyde present
Benedict's Solution CuSO₄ + alkaline sodium citrate Red-brown precipitate (Cu₂O) Aldehyde present
Sodium bisulphite Saturated NaHSO₃ solution White crystalline precipitate Aldehyde present
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