The acidic property of phenol can be explained when it is reacted with:

In the given conversion,the compound $A$ is:

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 $....$

Heating benzoic acid with $X$ or phenol with $Y$ gives benzene. $X$ and $Y$ are respectively:

Which of the following can be used to separate phenol and benzoic acid?

Identify the products $[A]$ and $[B]$,respectively in the following reaction: