Which of the following compounds has the highest boiling point?

Arrange water,ethanol and phenol in increasing order of acidity and give reason for your answer.

For the given compounds,the correct order of increasing $pK_{a}$ value is:

In the reaction sequence,phenol reacts with $HNO_2$ to form $X$,which then reacts with phenol in the presence of $H_2SO_4$ to form $Y$. Identify the major products $X$ and $Y$.

How can phenol and cyclohexanol be distinguished?

Identify compound $(Z)$ in the following reaction sequence.