Identify the missing reagent in the following reaction:

Compound $'P'$ on nitration with dil. $HNO_{3}$ yields two isomers $(A)$ and $(B).$ These isomers can be separated by steam distillation. Isomers $(A)$ and $(B)$ show the intramolecular and intermolecular hydrogen bonding respectively. Compound $(P)$ on reaction with conc. $HNO_{3}$ yields a yellow compound $'C',$ a strong acid. The number of oxygen atoms present in compound $'C'$ is:

The reaction is given as: $X \xrightarrow{Y} \text{Benzoquinone}$. Identify $X$ and $Y$ in the above reaction.

What does phenol give with $NaOH$ and $CHCl_3$ at $340 \ K$?

What is the name of the reaction between an aromatic acyl chloride and phenol in the presence of a base like $NaOH$ or pyridine?

Thymol,which is primarily a derivative of phenol,is used in which of the following?