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Solution


Q.

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is             [2017, 1999, 1993]
1 chromatography  
2 crystallisation  
3 steam distillation  
4 sublimation  

Ans.

(3)

The o- and p-nitrophenols are separated by steam distillation since o-isomer is steam volatile due to intramolecular H-bonding while p-isomer is not steam volatile due to association of molecules by intermolecular H-bonding.