Which of the following is a reactant of Fries rearrangement?

Phenyl acetate

The correct answer is option 2. Phenyl acetate.

The Fries rearrangement is a reaction that involves the migration of an acyl group in phenolic esters to form hydroxy aryl ketones under the influence of a Lewis acid catalyst, such as aluminum chloride (AlCl₃).

The general reaction for the Fries rearrangement is:
\(\text{Phenyl ester}\overset{\text{AlCl}_3}{\longrightarrow}\text{Hydroxy aryl ketone}\)

Given this, the correct reactant for the Fries rearrangement is Phenyl acetate.

Thus, the reaction may be written as: