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Compare the acidic character of the foll...

Compare the acidic character of the following:

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The correct Answer is:
Acid strength order : `II gt IV gt III gt I`
Step-1: In nitrophenols -I effect of `NO_(2)` will help to increase acidic strength hence phenol is least acidic amongst all nitrophenols
Steps-1: Only-I effect is applicable in meta nitrophenol is will is number three. Now -o,-p have both -I and -m effect of `NO_(2)` group over OH and in this particlular case para isomer is more acidic than ortho since
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