At low temperature phenol reacts with B r 2 i n C S 2 to form Options: A . &nbsp m-bromophenol B . &nbsp o-and p-bromophenol C . &nbsp p-bromophenol D . &nbsp 2, 4, 6-tribromophenol

At low temperature phenol reacts with Br2 in CS2to form

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Question -

At low temperature phenol reacts with $B r_{2} i n C S_{2}$ to form

Options:

A . m-bromophenol

B . o-and p-bromophenol

C . p-bromophenol

D . 2, 4, 6-tribromophenol

Answer: Option B
:
B

In presence of non-polar solvent $(C S_{2})$ the ionization of phenol is suppressed. The ring is slightly activated and hence mono substitution occurs with p-bromophenol as the major product.

On the other hand with water phenol forms 2, 4, 6-tribromo phenol. $(C S_{2})$

In aqueous solution phenol ionizes to give phenoxide ion. Due to the presence of negative charge of

oxygen the benzene ring is highly activated and hence trisubstituted product is obtained.

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