हिंदी

Classification of Aldehydes, Ketones and Carboxylic Acids

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Classification of Aldehydes, Ketones and Carboxylic Acids

  • Ether C–O cleavage reactions: With HX (100 °C) → R–OH + R–X; PCl₅ → R–Cl + R′–Cl; dil. H₂SO₄ → R–OH + R′–OH; R′COCl/(R′CO)₂O with AlCl₃ → esters.
  • Reactivity order of HX with ethers: HI > HBr > HCl.
  • Preparation of ethers: Dehydration of alcohols (conc. H₂SO₄, 443 K), catalytic dehydration (Al₂O₃, 250 °C), Williamson synthesis (Sₙ2), and alkyl halides + dry Ag₂O.
  • Carbonyl compounds classification: Aldehydes (R–CHO, Ar–CHO), ketones (aliphatic/aromatic — simple or mixed), and carboxylic acids (RCOOH, ArCOOH).
  • Carboxylic acid types: Mono- (propionic acid), di- (oxalic acid), and tri-carboxylic acid (citric acid).
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