Explain the following properties of benzene:
(1) only undergoes substitution reactions
(2) nucleophilic
These three compounds can undergo electrophilic substitution at different rates. Rank their reactivity from the SLOWEST (1) to the FASTEST (3).
Explain why having different substituents (-Cl, -CH3, -OH) have different effects on the rate of substitution reaction.
Phenylethene undergoes the following reactions to form compound A.

What is the structural formula of A?