Chlorobenzene is formed by the reaction of chlorine with benzene in the presence of AlCl3. Which of the following species attacks the benzene ring in this reaction?

1.  Cl-     

2.  Cl+       

3.  AlCl3      

4.  AlCl4-

In this reaction, AlCl3 will act as lewis acid catalyst which facilitate hetrolytic cleavage of chlorine molecule to produce Cl+ and \(AlCl_{4}^{-}\). This CI+ will act as electrophile which further attacks on electronically rich benzenoid ring and give aromatic electrohilic substitution.