11.65 You are given benzene, conc. H2SO4 and NaOH. Write the equations for the preparation of phenol using these reagents.
11.65 You are given benzene, conc. H2SO4 and NaOH. Write the equations for the preparation of phenol using these reagents.
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1 Answer
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11.65
The reaction given below is:
Benzene reacts with concern. H2SO4 and undergoes the following mechanism:-
Step 1: The equilibrium produces SO3 in concentrated H2SO4, as shown below:
Step 2: SO3 is the electrophile which reacts with benzene to form arenium ion, as shown below:
Step 3: A proton is removed from the arenium ion to form benzenesulfonate ion.
Step 4: The benzenesulfonate ion accepts a proton to become benzene-sulphonic acid, as shown below:
Step 5: The benzene sulphonic acid then reacts with NaOH to give phenol as the final product, as shown below:
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