Identify the product $(P)$ formed from the following reaction.

Provide basic information and examples of aromatic compounds.

Which of the following compounds is most reactive toward electrophilic substitution reaction?

Heating benzene in a large excess of $80\% \, D_2SO_4$ in $D_2O$ results in what product?

Consider the following reactions:
$C_2 H_2 \xrightarrow[500^{\circ}C]{\text{red hot iron tube}} A$
$A \xrightarrow[70^{\circ}C]{\text{conc. } HNO_3, \text{conc. } H_2 SO_4} B$
$B \xrightarrow{LiAlH_4} C_6 H_5-N=N-C_6 H_5$
$A$ and $B$ are:

The ease of nitration of the following three hydrocarbons follows the order: $(I)$ Toluene, $(II)$ $m$-Xylene, $(III)$ $p$-Xylene.