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Question

The strongest acid among the following aromatic compound is:

A
o-Nitrophenol
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B
p-Chlorophenol
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C
p-Nitrophenol
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D
m-Nitrophenol
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Solution

The correct option is B p-Nitrophenol
The strongest acid among the following aromatic compound is p-Nitrophenol. When strong electron withdrawing nitro group is present in para position, the loss of proton from -OH group becomes easy as the phenoxide ion is resonance stablizied and nitro group decreases electron density from phenoxide ion. This increases the acidic behaviour.
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