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General Mechanism of Electrophilic Aromatic Substitution

What is the r...

Question

What is the rate-determining step in the reaction of ${B r}_{2}$ with benzene in the presence of $F e {B r}_{3}$ , to produce bromobenzene?

The reaction of benzene with

F e {B r}_{3} - {B r}_{2}

to produce the sigma complex

C_{6} H_{6}^{+} - B r

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The reaction of

{B r}_{2}

with

F e {B r}_{3}

, to produce

{B r}^{+}

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The reaction of

{B r}_{2}

with

F e {B r}_{3}

to produce

F e {B r}_{3} - {B r}_{2}

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The loss of a portion from the sigma complex

{C_{6} H}_{6}^{+} - B r

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Solution

The correct option is B The reaction of benzene with $F e {B r}_{3} - {B r}_{2}$ to produce the sigma complex $C_{6} H_{6}^{+} - B r$
In bromination of benzene formation of complex ion $C_{6} H_{6}^{+} - B r$ is rate determining step.
Mechanism of reaction:

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