Correct sequence of decreasing order of acid strength of the given compounds is -

Propan-1-ol, 2,4,6-trinitrophenol, 3-nitrophenol, 3,5-dinitrophenol, phenol, 4-methylphenol.
 

1. 2,4,6-trinitrophenol > 3-nitrophenol > 3,5-dinitrophenol > phenol < 4-methylphenol > Propan-1-ol
2. 2,4,6-trinitrophenol > 3,5-dinitrophenol > 3-nitrophenol > phenol > 4-methylphenol > Propan-1-ol
3. 2,4,6-trinitrophenol > 3-nitrophenol > phenol >  3,5-dinitrophenol  > 4-methylphenol > Propan-1-ol
4. 3-nitrophenol > phenol >  3,5-dinitrophenol  > 4-methylphenol > Propan-1-ol > 2,4,6-trinitrophenol




 

Subtopic:  Phenols: Preparation & Properties |
 90%
From NCERT
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