हिंदी

Chemical Properties of Carboxylic Acids

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Chemical Properties of Carboxylic Acids

  • Acid strength order: Greater halogen electronegativity → stronger acid, smaller pKₐ; F–CH₂COOH > Cl–CH₂COOH > Br–CH₂COOH > I–CH₂COOH > CH₃COOH.
  • Substituent effect: EWG (–Cl, –CN, –NO₂) ↑ acidity; EDG (–CH₃, –OH, –OCH₃) ↓ acidity; 4-nitrobenzoic acid > Benzoic acid > 4-methyl benzoic acid.
  • Tests for –COOH: Litmus (blue → red), NaHCO₃ (CO₂↑), Ester test (with C₂H₅OH/H⁺ gives ester).
  • Key conversions: SOCl₂/PCl₃/PCl₅ → acyl chloride; NH₃ (Δ) → amide; P₂O₅ (Δ) → acid anhydride.
  • Decarboxylation & reduction: RCOONa + NaOH/CaO (Δ) → R–H + Na₂CO₃; RCOOH + LiAlH₄/dry ether → RCH₂OH.
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