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Explain the method of preparation of carboxilic acid from (1) Alcohols (2) Aldehyde

Explain the method of preparation of carboxilic acid from (1) Alcohols (2) Aldehyde

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(i)From alcohols: Primary alcohols are readily oxidised to carboxylic acids with common oxidising agents such as potassium permanganate (KMnO4)  in neutral, acidic or alkaline media or by potassium dichromate (K2Cr2O7) and chromium trioxide (CrO3) in acidic media.

(ii) From aldehydes: Oxidation of aldehydes in presence of mild oxidizing agents  like Tollen’s reagent (ammoniacal solution of AgNO3) or Fehling reagent (Fehling solution A (aqueous solution of CuSO4) + Fehling solution B (aqueous solution of sodium potassium tartarate)) forms carboxylic acids

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