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Starting from benzene diazonium chloride...

Starting from benzene diazonium chloride, how can phenol be prepared ? How can phenol be sulphonated ? What is the electrophile for this reaction?

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Sulphonation of phenol
When treated with conc. `H_2SO_4`, phenol is readily sulphonated to produce o-phenol sulphonic acid and P-phenol sulphonic acid
`SO_3overset(o+)H` is the electrophile.
`2H_2SO_4hArrSO_3overset(o+)H+HSO_4^(o+)+H_2O`
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