The best method to separate a mixture of ortho and para nitrophenol `(1 : 1)` is :

The best method to separate the mixture of ortho and para nitrophenol (1 : 1) is

The best method to separate the mixture of ortho and para nitrophenol (1:1) is

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

The most suitable method of separation of amixture of ortho and para nitrophenols mixed in the ratio of 1:1 is

The most suitable method of separation of a mixture of ortho and para nitrophernol in the ratio 1:1 is :