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Q.
In the following compounds
The order of acidity is
Solution:
Nitro group from para position exert electron withdrawing
resonance effect, increases acidity of phenol the most. This is
followed by meta nitrophenol in which nitro group exert
electron withdrawing effect on acidity. $CH_3- $ is an electron
donating group, decreases acid strength. Hence, the overall
order is
$ IV > III > I > II $
