Which of the compounds in the previous problem are aromatic? Which are isomers? a.ethylene b.1-butene c.2-chloro-1,3-butadiene d.2,5-dimethyl-3-hexene e.3-isopropylcyclopentene f.1,3-dimethylbenzene g.tert-butylbenzene h.toluene i.p-xylene j.o-xylene k.1,3-cyclopentadiene