NEET 2017 Chemistry question

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

(1)Sublimation
(2)Chromatography
(3)Crystallisation
(4)Steam distillationCorrect

Answer: (4)

Solution

o-Nitrophenol has intramolecular hydrogen bonding, so its molecules are not associated; it is volatile with steam. p-Nitrophenol has intermolecular hydrogen bonding (association), so it is much less volatile and does not distil with steam. Hence the ortho isomer

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Question ID VK-092092