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Explain Fehling's solution Test. |
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Answer» Solution :(1) Fehling 's solution is MIXTURE of Fehling's solution 'A' CONTAINING `CuSO_(4)`solution and Fehling'ssolution 'B' contaning SODIUM potassium tartarate (Rochelle salt) in caustic soda (NaOH) solution . (2) Whenan aldehyde is heated with fehling's solution. The deep blue colour of the solution disappears, and`Cu^(+2)`(cupric ion) is reduced and a red precipitate of cuprous oxide, `Cu_(2)O` is obtained while aldehyde is oxidised to a carboxylic acid. (3) For example ,  (4)This testis not given by ketones, since they cannot be oxidised by Fehling solution. (5) Aromatic aldehydes are not oxidised by Fehling solution. (6) Hence this test is used to distinguish between aldehydes and ketones. |
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