Unusual Reactions Alkene KMnO4>diol (addition) Benzene KMnO4->no reaction. Alkene Br2/CCl4>dibromide (addition) -Benzene Br2/CCl4->no reaction. With FeCl3 catalyst,Br2 reacts with benzene to form bromobenzene HBr (substitution!). -Double bonds remain. Unusual Reactions Alkene + KMnO4  diol (addition) Benzene + KMnO4  no reaction. Alkene + Br2 /CCl4  dibromide (addition) Benzene + Br2 /CCl4  no reaction. With FeCl3 catalyst, Br2 reacts with benzene to form bromobenzene + HBr (substitution!). Double bonds remain