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Physical Properties of Alcohols and Phenols

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Estimated time: 4 minutes
CBSE: Class 12
Maharashtra State Board: Class 12

Key Points: Physical Properties of Alcohols and Phenols

  • Intermolecular Forces — Alcohols and phenols are polar; –OH groups form strong hydrogen bonding.
  • Boiling Point — Increases with molecular mass; decreases with branching (n-butyl > isobutyl > sec-butyl > tert-butyl).
  • Solubility — Phenols and lower alcohols (≤3 C) are water-soluble via H-bonding with water.
  • Phenol is less soluble than alcohols due to the large hydrophobic benzene ring.
  • Lower alcohols are colourless liquids, higher ones become waxy solids.
  • Phenols are crystalline solids with a characteristic odour and higher boiling points.
  • Kolbe's & Reimer–Tiemann — Phenoxide + CO₂/H⁺ → salicylic acid; + CHCl₃/NaOH → salicylaldehyde (electrophile: CCl₂).
  • Oxidation/Reduction of Phenol — Na₂Cr₂O₇/H₂SO₄ → p-benzoquinone; 3H₂/Ni/433 K → cyclohexanol; Zn → benzene.
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