Question

Arrange the following compounds in increasing order of their acid strength.
Propan-1-ol, 2,4,6-trinitrophenol, 3-nitrophenol, 3, 5-dinitrophenol, phenol, 4- methyl phenol .

Answer 1

The acidic strength of the given compound in decreasing order is given below

$propanol<4-methylphenol<phenol<3-nitrophenol<2,4,6-trinitrophenol$

Due to all alcohols are less acidic than phenols

And $-I$ power increases acidic strength,

While $+I$ power decreases acidic character.

So,

$propanol<4-methylphenol<phenol<3-nitrophenol<2,4,6-trinitrophenol$

This the required order.