हिंदी

Preparation of Carboxylic Acids

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Preparation of Carboxylic Acids

  • Special preparations: Benzoic acid from cumene (KMnO₄/KOH, Δ → H₃O⁺); adipic acid from cyclohexene (KMnO₄/dil. H₂SO₄, Δ).
  • Aldehyde preparation: From 1° alcohol (K₂Cr₂O₇/H₂SO₄ or Cu/573 K), alkene (ozonolysis), alkyne (dil. H₂SO₄/HgSO₄), acid chloride (Rosenmund), nitrile (Stephen/DIBAL-H); aromatic via Etard, CrO₃/(CH₃CO)₂O, Cl₂/hν, Gatterman–Koch.
  • Aldehyde reactions: HCN → cyanohydrin; NaHSO₃ → bisulphite adduct; R′OH → acetal; RMgBr → 2° alcohol; NH₂OH → aldoxime; NH₂NH₂ → hydrazone; K₂Cr₂O₇ → COOH; Clemmensen/Wolf–Kishner → alkane.
  • Carboxylic acid preparation: From nitriles (hydrolysis), acyl chloride/anhydride/ester + H₂O, CO₂ + RMgX (dry ether, H₃O⁺), alkylbenzene (KMnO₄–KOH).
  • Carboxylic acid reactions: PCl₅/SOCl₂ → RCOCl; NH₃ → amide; P₂O₅ → anhydride; NaOH + CaO (Δ) → alkane; LiAlH₄ → 1° alcohol; ROH/conc. H₂SO₄ → ester.
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