NEET 2017 · ChemistryIonic characterPrevious Year Question
The most suitable method of separation of a 1 : 1 mixture of ortho- and para-nitrophenols is
Answer: (D) Steam distillation. \textbf{Answer:} (D) Steam distillation \textbf{Solution:} Ortho-nitrophenol has intramolecular hydrogen bonding so it is volatile and steam-volatile, while para-nitrophenol has intermolecular hydrogen bonding and is not steam-volatile; hence the pair separates by steam distillation.
- A.Sublimation
- B.Chromatography
- C.Crystallisation
- D.Steam distillation✓
Correct Answer
(D) Steam distillation
Solution & Explanation
\textbf{Answer:} (D) Steam distillation \textbf{Solution:} Ortho-nitrophenol has intramolecular hydrogen bonding so it is volatile and steam-volatile, while para-nitrophenol has intermolecular hydrogen bonding and is not steam-volatile; hence the pair separates by steam distillation.
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