Which catalyst is used in the following reaction?

The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is:

Which of the following is an example of a non-benzenoid aromatic compound?

In the reaction $C_6H_5CH_3$ $\xrightarrow{\text{Oxidation}} A$ $\xrightarrow{NaOH} B$ $\xrightarrow{\text{Sodalime}} C$. Then $C$ is

Which of the following are not aromatic?

Which of the following will show aromatic behaviour?