In Friedel-Crafts acylation,besides $AlCl_3$,the other reactants are

What are $X$ and $Y$ in the following reactions?

Phenol is treated with bromine water and shaken well. The white precipitate formed during the process is

The main product of the following reaction will be:

Reaction of phenol with $NaOH$ followed by heating with $CO_{2}$ under high pressure,and subsequent acidification gives compound $X$ as the major product,which can be purified by steam distillation. When reacted with acetic anhydride in the presence of a trace amount of conc. $H_{2}SO_{4}$,compound $X$ produces $Y$ as the major product. Compound $Y$ is $....$

Which of the following orders is true regarding the acidic nature of phenol and its derivatives?