When preparing phenol from benzene via a sulphonic acid intermediate, benzene is first treated with oleum () to yield compound 'P'. 'P' is then fused with molten followed by acidification to produce p

Question

When preparing phenol from benzene via a sulphonic acid intermediate, benzene is first treated with oleum ($H_2S_2O_7$) to yield compound 'P'. 'P' is then fused with molten $NaOH$ followed by acidification to produce phenol. What is the chemical identity of intermediate 'P'?

Prashant Kotian · Accepted Answer

Correct answer: B. The reaction of benzene with oleum (fuming sulphuric acid) results in electrophilic aromatic substitution, yielding benzenesulphonic acid ('P'). Fusing benzenesulphonic acid with yields sodium phenoxide, which upon acidification gives phenol.

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