1.

Assertion : Phenol is more reactive than benzene towards electrophilicsubstitution-reaction Reason : In the case of phenol, the intermediated carbocation is more resonance stabilised

Answer»

Both assertion and REASON are correct and reason is the correct explanationof the assertion.
Both assertion and reason are correct, but reason is not thecorrect explanation of the assertion
Assertion is correct , but reason is incorrect
Assertion is incorrect , but reason is correct

Solution :In phenol , -OH group is attached with C-atom of benzene ring. OH-group SHOWS + M EFFECT so, it is able to ACTIVATE the benzene ring as follows

Thus, the electron density of ortho and para-position is higher in comparison to benzene. Hence electrophile MUST be attached on o/p position.

The more stabilized carbanion and thus facilitate attack of electrophile


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