Most common reactions of benzene (aromatic hydrocarbon) and its derivatives are

The major product of the following reaction is:

Identify the non-benzenoid aromatic compound from the following:

If $p$-methoxytoluene is nitrated,the major product is:

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

In the nitration mixture,concentrated sulfuric acid $(H_2SO_4)$ is used as: