Which of the following reactions will yield phenol?

When Chlorobenzene is fused with NaOH at 300 atm and 623K followed by acidification, it results in the formation of Phenol. Hence, the option (i) is correct.

When Aniline is treated with NaNO₂ + HCl,a Diazonium salt is formed. Then, Diazonium salts are hydrolyzed by warming with water to Phenols. Hence, option (ii) is correct.

Benzene is first sulphonated with Oleum to form benzene sulphuric acid and then, it is converted to sodium phenoxide by heating benzene sulphuric acid with molten NaOH. Acidification of sodium phenoxide results in the formation of phenol. Hence, the option (iii) is correct.

Option (iv) is incorrect because of Chlorobenzene when fused with NaOH at 623K and 300 atmospheric pressure followed by acidification results in the formation of Phenol.