Using anhydrous AlCl₃ as catalyst, which one of the following reaction produces ethylbenzene (PhEt)?

1) H₂C=CH₂+C₆H₆
2) H₃C−CH3+C₆H₆
3) H₃C−CH₂OH+C₆H₆
4) CH₃−CH=CH₂+C₆H₆