JEE Main · 2025 · Shift-IImediumSOL-153

Which of the following binary mixture does not show the behaviour of minimum boiling azeotropes?

Solutions · Class 12 · JEE Main Previous Year Question

Question

Which of the following binary mixture does not show the behaviour of minimum boiling azeotropes?

Options
  1. a

    \ceH2O+CH3COC2H5\ce{H2O + CH3COC2H5}

  2. b

    \ceC6H5OH+C6H5NH2\ce{C6H5OH + C6H5NH2}

  3. c

    \ceCS2+CH3COCH3\ce{CS2 + CH3COCH3}

  4. d

    \ceCH3OH+CHCl3\ce{CH3OH + CHCl3}

Correct Answerb

\ceC6H5OH+C6H5NH2\ce{C6H5OH + C6H5NH2}

Detailed Solution

Strategy:\n> Minimum boiling azeotropes occur when a system shows large positive deviation from Raoult's Law (weak A-B interactions). Maximum boiling azeotropes occur when there is negative deviation (strong A-B interactions).\n\nAnalysis:\n- (a) \ceH2O+CH3COC2H5\ce{H2O + CH3COC2H5} (Water + MEK): Positive deviation     \implies Min boiling.\n- (c) \ceCS2+acetone\ce{CS2 + acetone}: Positive deviation     \implies Min boiling.\n- (d) \ceCH3OH+CHCl3\ce{CH3OH + CHCl3}: Positive deviation     \implies Min boiling.\n- (b) \ceC6H5OH+C6H5NH2\ce{C6H5OH + C6H5NH2} (Phenol + Aniline): These form a strong intermolecular hydrogen bond. This leads to negative deviation and thus a Maximum boiling azeotrope.\n\ntextAnswer:(2)\boxed{\\text{Answer: (2)}}

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