Q73 of 74 Page 164

How can phenol be converted to aspirin?

The structure of Aspirin is:


Conversion of phenol to Aspirin is done in two steps.


Step1


First, phenol is converted to Salicylic acid by the following reaction:



Step2


Salicylic acid on acetylation( introducing acetyl group –COCH3) using acetic anhydride produces Aspirin.



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70

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Phenols give o- and p-nitrophenol on nitration with conc. HNO3 and H2SO4 mixture.


Reason : —OH group in phenol is o–, p– directing.


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Write the mechanism of the reaction of HI with methoxybenzene.

 72

(a) Name the starting material used in the industrial preparation of phenol.

(b) Write complete reaction for the bromination of phenol in aqueous and non-aqueous medium.


(c) Explain why Lewis acid is not required in bromination of phenol?


 74

Explain a process in which a biocatalyst is used in the industrial preparation of a compound known to you.