As we have learnt,
Phenol on reaction with Bromine water forms 2,4,6-Tribromophenol.
This is attributed to the polarity of water which facilitates the formation of Phenoxide ion which is highly activated toward Electrophilic Substitution.
Monobromination can be carried out using non-polar solvents like or
and solvents with low dielectric constant
It Is to be noted that Lewis acids are not prefered in the reaction because Phenol itself forms a complex with lewis acids and gets deactivated towards electrophilic substitution.
Hence, the correct answer is option (1)
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