Q.

Benzene reacts with n-propyl chloride in the presence of anhydrous AlCl3 to give

1 3-Propyl-1-chlorobenzene  
2 n-Propylbenzene  
3 No reaction  
4 Isopropylbenzene  

Ans.

(4)

CH3-CH2-CH2-Cl→AlCl3CH3-CH2-CH2+

CH3-CH2-CH2⊕→shift1,2-H⊖CH3-CH⊕-CH3