When chlorobenzene reacts with sodium hydroxide at 350°C and 150 atmospheric pressure, it gives rise to the formation of:

Explanation

When chlorobenzene (C₆H₅Cl) reacts with sodium hydroxide (NaOH) at 350°C and 150 atmospheric pressure, it undergoes a nucleophilic substitution reaction known as the Dow process, resulting in the formation of sodium phenoxide (C₆H₅ONa). The reaction benefits from the high temperature and pressure, which facilitate the substitution of the chlorine atom with a hydroxide ion. Sodium phenoxide can later be acidified to produce phenol (C₆H₅OH). Other options, such as sodium chromate and sodium sulfate, are incorrect as they are not products of this reaction. Phenol is formed only after further processing of sodium phenoxide, and phenoxide alone does not specify the sodium salt form.