Write the name and structure of the benzene derivatives described below.
(a) Formula: \(\mathrm{C}_{8} \mathrm{H}_{10} ;\) forms three monochlorination
products when treated with \(\mathrm{Cl}_{2}\) and \(\mathrm{FeCl}_{3}\)
(b) Formula: \(\mathrm{C}_{9} \mathrm{H}_{12}\); forms one monochlorination
product when treated with \(\mathrm{Cl}_{2}\) and \(\mathrm{FeCl}_{3}\)
(c) Formula: \(\mathrm{C}_{9} \mathrm{H}_{12}\); forms four monochlorination
products when treated with \(\mathrm{Cl}_{2}\) and \(\mathrm{FeCl}_{3}\)