question_answer

Phenol \[\xrightarrow{X}\] forms a tribromo derivative. X is

A)  bromine in benzene  

B)  bromine in water

C)  \[KBr\] solution         

D)  \[B{{r}_{2}}\] in \[CC{{l}_{4}}\] at \[{{0}^{o}}C\]

Correct Answer: B

Solution :

                X is bromine in water. With aqueous , bromination occurs at both the o- and one p-positions to give 2,4,6-tribromophenol while with \[B{{r}_{2}}\] in \[CC{{l}_{4}}\], bromination occurs mainly at the less hindered p-position to give p-bromophenol as the major product.