Due to resonance,the oxygen atom of the $-OH$ group in phenol:

The nitration of phenol with dilute $HNO_3$ at low temperature yields a mixture of two isomers $(A)$ and $(B)$. Product $(A)$ is more volatile than product $(B)$. Identify $(A)$.

Hybridisation shown by Carbon and Oxygen of $-OH$ group in phenol are respectively . . . . . . .

Which one is the most acidic compound?

Which of the following is a true statement about the reaction shown?

Arrange the following compounds in order of decreasing acidity: