Which of the following structures represents cumene?

Benzene is prepared in the laboratory from which one of the following compounds?

The ratio of $\sigma$ and $\pi$ bonds in benzene is:

Which of the following represents a Friedel-Crafts reaction?

Identify the major product from the following reaction sequence.

For the electrophilic substitution reaction involving nitration,which of the following sequences regarding the rate of reaction is true?