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Question

The most suitable method for the separation of a 1:1 mixture of ortho and para nitrophenols is:

A
Distillation
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B
Sublimation
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C
Crystallization
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D
Chromatography
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Solution

The correct option is A Distillation
Ortho nitrophenol shows intramolecular H-bonding while para nitrophenol shows intermolecular H-bonding. Therefore, the boiling point of ortho nitrophenol is lower than that of para nitrophenol.
When two miscible components have difference in their boiling points, distillation is the best suited separation technique.

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