NCERT Exemplar Chemistry

Question

Assertion: Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid.
Reason: Lewis acid polarises the bromine molecule. 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 wrong because the —OH group in phenol is highly activating; thus, the bromination of phenol occurs readily even in the absence of a Lewis acid catalyst. The Reason is a correct statement generally, as Lewis acids are used in electrophilic aromatic substitutions (like with benzene) specifically to polarise the halogen molecule and generate the electrophile.

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Chemistry > Organic Chemistry > Alcohols Phenols And Ethers

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