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Q. How benzene is converted into n - propyl benzene

UPSEEUPSEE 2018

Solution:

Friedel crafts acylation followed by

clemmensen reduction forms $n$-propyl benzene as follows :

image

Friedel craft alkylation method can also be used for conversion of benzene to n-propyl benzene. But the electrophile image formed in $F. C$ acylation method is more electrophilic in nature

than the electrophile $(CH_3CH_2\, \overset{⊕}{C}H_2)$ formed in $F. C$ alkylation method.

Hence, $F.C$ acylation followed by clemmensen reduction is more preferrable.