Given are cyclohexanol (I), acetic acid (II), 2,4,6 ‐ trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be
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III 
Since, phenols and carboxylic acids are more acidic than aliphatic alcohols, we find that cyclohexanol (I) is least acidic. Out of the two given phenols, III is more acidic than IV This is because of the presence of three highly electron withdrawing 
groups on the benzene ring which makes the 
bond extremely polarized. This facilitates the release of 
as 
Thus, III 
In acetic acid, the electron withdrawing 
in the 
group polarises the 
bond and increases the acidic strength. Acetic acid is therefore more acidic than phenol or cyclohexanol.
The order is 
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