Which reagent is used for bromination of methyl phenyl ether ?

B r_{2} / C H_{3} C O O H

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B r_{2} / R e d P

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B r_{2} / F e B r_{3}

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H B r / Δ

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Solution

The correct option is A $B r_{2} / C H_{3} C O O H$
Phenylalkyl ethers undergo halogenation at ortho/para of alkoxy group with bromine in ethanoic acid even in the absence of iron (III) bromide catalyst. It is due to the activation of benzene ring by the alkoxy group. Para isomer is obtained in 90% yield.
Option A is correct.

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{B r}_{2}

F e {B r}_{3}

H_{2} O + B r_{2} \to H O B r + H B r

B r_{2}

C H_{3} - C H_{3} + B r_{2} \to C H_{3} - C H_{2} - B r + H B r

C H_{3} - C H_{3} + B r_{2} \to 2 C H_{3} B r

Bromination of salicylic acid with $B r_{2}$ water gives

H_{2} O + {B r}_{2} ⟶ H O B r + H B r