Mark the correct order of decreasing acid strength of the following compounds:
IV 
II 
I 
III
IV 
I 
III 
V
V 
III 
II 
I
IV 
III 
II 
I
Text Solution
Verified by ExpertsB
Presence of electron withdrawing group on phenols, increases its acidic strength. So, both
compounds i.e., p-nitrophenol (II) and m-nitrophenol (IV) are stronger acid than (I). If 
group is present at m-position, then it exerts - I effect mly. Therefore, p-nitrophenol is much stronger acid than m-nitrophenol.
On the other hand, presence of electron releasing group on phenol, decreases its acidic strength. If 
group is present at meta position, it will not exert +R effect but exert-I effect.
But, if it is present at para position, then it will exert + R effect. Therefore, m-methoxyphenol is more acidic than p-methoxy phenol.
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