Phenol, `p-`methylphenol, `m-`nitrophenol and `p-`nitrophenol follow order of increasing acidic strength

Arrange p-nitrophenol, o-nitrophenol and phenol in order of decrease in acidity.

In the following compounds phenol (I), p-cresol (II), m-nitrophenol (III) and p-nitrophenol (IV), the order of acidity is:

The increasing order of acidity among phenol, p-methylphenol, m-nitrophenol and p-nitrophenol is:

The increasing order of acidity among phenol, p-methylphenol, m-nitrophenol and p-nitrophenol is:

Compare the acidic strength of phenol and o-nitrophenol.