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How will you prepare phenol (i) From chloro benzene (ii) From benzene sulphonic acid? |
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Answer» Solution :(i) From halo arenes (Dows process): When Chlorobenzene is hydrolysed with `6-8%` of NAOH at 300 bar and 633 K in a closed VESSEL, sodium phenoxide is formed which on treatment with dilute HCl gives PHENOL.  (ii) From benzene sulphonic acid: Benzene is sulphonated with oleum and the benzene sulphonic acid so formed is heated with motlen NaOH at 623 K gives sodium phenoxide which on acidification gives phenol.
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