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Q.

In the following compounds. The decreasing order of acidity is
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a

4>3>1>2 

b

2>1>3>4

c

1>4>3>2

d

4>3>2>1

answer is D.

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Detailed Solution

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Acidity is more, when the phenol has more number of electron withdrawing groups or the groups that show -I effect. 

Nitro group is a strong electron withdrawing group and its effect is more when it is at para position and less when it is at meta position. Therefore, 4 is more acidic than 3. Methyl is an electron releasing group, so acidity of 2 is the least. Therefore, the correct order is:
4>3>1>2 

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