The reagent used in Friedel-Crafts reaction is:

What are the major products obtained in each case when compounds $P, Q,$ and $S$ are nitrated using a mixture of $HNO_3/H_2SO_4$?

Benzene $ + Cl_{2(excess)} \xrightarrow[\Delta ]{AlCl_3} x$
$x$ is

In the reaction,
$X$ and $Y$ respectively are :-

Total number of aromatic compounds among the following compounds is:

Three fused benzene rings are found in