Phenol is heated with a solution of mixture of KBr and $\mathrm{KBrO}_{3}$. The major product obtained in the above reaction is

JEE Main · 2011 · 10 Apr 2011 · Offline · Alcohols Phenols and Ethers

Phenol is heated with a solution of mixture of KBr and

KBrO_{3}

. The major product obtained in the above reaction is

(A)3-Bromophenol
(B)4-Bromophenol
(C)2, 4, 6-Tribromophenol✓ Correct
(D)2-Bromophenol

Answer: (C)

Solution

A mixture of

KBr

and

KBr O_{3}

in acid generates bromine in situ,

5B r^{-} + Br O_{3}^{-} + 6 H^{+} \to 3B r_{2} + 3 H_{2} O

. The hydroxyl group of phenol strongly activates and directs to the ortho and para positions, so bromine substitutes at all three, giving 2,4,6-tribromophenol as the major product.

JEE Main · 2011 · 10 Apr 2011 · Offline · Single correct option

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