`n-`Propyl benzene can be obtained in quantitative yield by following method `:`
`(i)` By treating benzene with `n-` propyl chloride in presence of `AlCl_(3)`
`(ii)` By treating excess of benzene with `n-`propyl chloride in presence of `AlCl_(3)`
`(iii)` By treating benzene with allyl chloride in presence of `AlCl_(3)` followed by reduction
`(iv)` By treating benzene with propionyl chloride in the presence of `AlCl_(3)` followed by Clemmensen reduction