Preparation of Phenol from Benzene sulphonic acid with MECHANISM
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I don't have my notes right now so i cannot send the picture.
But
You add NaOH to it so that H2SO3 comes out leaving O-Na+ (substituted instead of sulphonic acid)
Then add H+ to make phenol :)
Rnx with NaOH followed by Rnx with Hcl gives benzene