n-Propyl benzene can be obtained in quantitative yield by following method :

(i) By treating benzene with n-propyl chloride in presence of ${\mathrm{AlCl}}_3$

(ii) By treating excess of benzene with n-propyl chloride in presence of ${\mathrm{AlCl}}_3$

(iii) By treating benzene with allyl chloride in presence of ${\mathrm{AlCl}}_3$ followed by reduction

(iv) By treating benzene with propionyl chloride in the presence of ${\mathrm{AlCl}}_3$ followed by Clemmensen reduction.