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 :

The most suitable method of separation of a 1:1 mixture of o- and p- nitrophenol is-

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

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

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