When benzene vapor is passed through a tube at $700 - 800\,^oC$ or over molten lead,it yields ........

Suggest the best reaction conditions for the synthesis shown below.

What is the role of $HNO_3$ in the nitrating mixture used for the nitration of benzene?

Nitration is an example of aromatic electrophilic substitution reaction and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol,which one is more easily nitrated?

The benzene molecule is

Assertion : Benzene removes a butter stain from a table cloth.
Reason : Butter has an affinity towards benzene.