What is the end product obtained on the nitration of toluene?

$X$ can be prepared by which of the following reactions,except?

Explain the mechanism for the nitration of benzene.

Among the following,the aromatic compounds are:
$(A)$ Heptafulvene
$(B)$ Benzene
$(C)$ Cyclopentadienyl anion
$(D)$ Cyclopentadienyl cation
Choose the correct answer from the following options:

Which compound contains delocalized electrons?

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