Consider the following sequence of reactions. The major product $P$ is:

Which of the following has the lowest heat of combustion?

Statement-$I$: Benzene gives Friedel-Crafts reaction.
Statement-$II$: All substituted benzenes give Friedel-Crafts reaction.
Choose the correct statement:

What is obtained by the bromination of benzene in the presence of $U.V.$ light?

Which of the following compounds is not aromatic?

Identify the correct statements for a ring system to exhibit aromaticity.
$(i)$ It must not be planar.
$(ii)$ It must possess $(4n+2) \pi$-electrons.
$(iii)$ It must be planar.
$(iv)$ It must possess $4n \pi$-electrons.
The correct answer is