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(a) Name the starting material used in t...

(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 ?

Text Solution

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(a) Cumene.
(b) N/A
(c) In bromination of benzene, Lewis acid is used to polarize `Br_(2)` to form the reactive electrophile, `Br^(+)`. In case of phenol, Lewis aciid is not required because of O-atom of phenol itself polarizes the `Br_(2)` molecule to form `Br^(+)` ions. further, +R-effect of OH group makes phenol highly activated towards electrophilic substitution reactions.
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