Answer: Dow’s method
Dow’s method is a technique for transforming chlorobenzene into phenol. To obtain sodium phenoxide ion, the reactant chlorobenzene is elevated with aqueous sodium hydroxide at temperatures of 623K and 300atm. Sodium phenoxide ion is then combined with Dilute HCl during the next step, that produces the final product as a phenol.
C6H5Cl + NaOH → C6H5OH + NaCl