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

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

A

CH3OH + CHCl3

B

C6H5OH + C6H5NH2

C

H2O + CH3COC2H5

D

CS2 + CH3COCH3

Answer

C6H5OH + C6H5NH2

Explanation

Solution

Key Concept: Minimum boiling azeotropes arise when the intermolecular attraction between unlike molecules is weaker than that between like molecules, leading to a negative deviation from Raoult’s law and a lower boiling point than either pure component.

Analysis of Options

  • CH3OH + CHCl3: Exhibits weak hydrogen bonding, shows negative deviation → minimum boiling azeotrope.
  • H2O + CH3COC2H5: Ethyl acetate–water system shows partial miscibility and negative deviation → minimum boiling azeotrope.
  • CS2 + CH3COCH3: Weak dipole–induced dipole interactions → minimum boiling azeotrope.
  • C6H5OH + C6H5NH2: Strong H‑bonding between phenol and aniline → positive deviation from Raoult’s law and forms a maximum boiling azeotrope, not a minimum one.

Conclusion: Only the phenol–aniline mixture does not show minimum boiling azeotrope behavior.