Which of the following is the strongest Bronsted acid?

The major product formed in the following reaction is:

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:

Which one of the following properties is exhibited by phenol?

What will be the major product of the given reaction?

Assertion : Phenol is a stronger acid than ethanol.
Reason : Groups with $+M$ effect decrease acidity at $p-$position.