Phenol on treatment with dil. $HNO_3$ gives two products $P$ and $Q$. $P$ is steam volatile but $Q$ is not. $P$ and $Q$ are,respectively:

Which among the following has the highest melting point?

How many $\sigma$ (sigma) and $\pi$ (pi) bonds are present respectively in the final product obtained by the Reimer-Tiemann reaction of phenol?

Write the chemical reactions for the preparation of anisole and phenetole from phenol.

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 $Y$.

Which of the following produces violet colour with $FeCl_3$ solution?