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NEET2005ChemistryGeneral Organic ChemistryActual

The best method for the separation of naphthalene and benzoic acid from their mixture is::

Options

  1. Adistillation
  2. Bsublimation
  3. Cchromatography
  4. Dcrystallisation

Correct answer

B. sublimation

Step-by-step solution

Naphthalene can sublime directly to vapour upon heating, but benzoic acid do not. Related Theory When benzoic acid is heated in presence of a strong dehydrating agent like P ₂ O ₅ or H ₂ SO _f it forms benzoic anhydride. 2 C ₆ H ₅ COOH BaOl ₅ ( C ₆ H ₅ CO )₂ O + H ₂ O Caution Naphthalene is volatile and benzoic acid is non-volatile due to the formation of dimer via hydrogen bonding (intermolecular).

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