$3,4$-Benzpyrene is a .....

The cyclopentadienyl anion is:

Benzene on treatment with a mixture of conc. $HNO_3$ and conc. $H_2SO_4$ at $90^\circ C$ gives :

In the presence of sunlight,benzene reacts with $Cl_{2}$ to give product $X$. The number of hydrogens in $X$ is $.....$

What is produced when benzene is alkylated with $n$-propyl chloride in the presence of anhydrous $AlCl_3$?

Which among the following pairs of the structures will give different products on ozonolysis? (Consider the double bonds in the structures are rigid and not delocalized.)