Three fused benzene rings are found in

When $o$-xylene is oxidized in the presence of $V_2O_5$,the product is:

Identify compound $A$ in the following reaction:
$\text{Benzene} + \text{ozone (excess)}$ $\rightarrow \text{Benzenetrizonide}$ $\xrightarrow{A} \text{glyoxal}$

The following compound has four aromatic rings marked as $A$,$B$,$C$ and $D$. Rank them in terms of increasing reactivity towards electrophilic aromatic substitution?

How many $\pi$ electrons are present in naphthalene to decide its aromaticity?

Arrange the following compounds in the increasing order of their reactivity towards electrophilic aromatic substitution:
$(I)$ Benzene
$(II)$ Toluene $(C_6H_5CH_3)$
$(III)$ Anisole $(C_6H_5OCH_3)$
$(IV)$ Benzaldehyde $(C_6H_5CHO)$