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Assertion : Ortho-nitrophenol is more acidic than meta-nitrophenol.
Reason: Ortho-nitrophenol has more -I-effect than meta-nitrophenol.
Options:
Reason: Ortho-nitrophenol has more -I-effect than meta-nitrophenol.
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The correct answer is:
If both assertion and reason are true but reason is not the correct explanation of assertion.
Ortho-nitrophenol is more acidic than meta-nitrophenol because at ortho-position, $-\mathrm{NO}_2$ group shows $-M$-effect also but at meta-position, $-\mathrm{NO}_2$ group shows only $-I$-effect.
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