The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is :
(1) Chromatography (2) Crystallisation
(3) Steam distillation (4) Sublimation

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(3) Steam distillation is the most suitable method of separation of 1 : 1 mixture of ortho and para nitrophenols as there is intramolecular hydrogen bonding in o-nitrophenol.

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