NCERT Exemplar Chemistry

Question

Assertion: Phenols give o- and p-nitrophenol on nitration with conc. $ ext{HNO}_3$ and $ ext{H}_2 ext{SO}_4$ mixture.
Reason: —OH group in phenol is o–, p– directing. A). Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. B). Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. C). Assertion is a correct statement but Reason is a wrong statement. D). Assertion is a wrong statement but Reason is a correct statement.

Edvaya · Accepted Answer

The correct answer is Assertion is a wrong statement but Reason is a correct statement.. The Assertion is a wrong statement because nitration of phenol with a mixture of concentrated $	ext{HNO}_3$ and concentrated $	ext{H}_2	ext{SO}_4$ (a strong nitrating mixture) yields 2,4,6-trinitrophenol (picric acid). To get a mixture of o - and p -nitrophenols, dilute $	ext{HNO}_3$ must be used. The Reason is a correct statement because the —OH group is indeed an activating and o -, p -directing group due to its +R effect.

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Chemistry > Organic Chemistry > Alcohols Phenols And Ethers

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