Acetophenone is shown below.) Friedel-Crafts acylation of fluorobenzene with ace
ID: 880060 • Letter: A
Question
Acetophenone is shown below.) Friedel-Crafts acylation of fluorobenzene with acetyl chloride and aluminum chloride occurs
faster than acylation of benzene and gives mostly m-fluoroacetophenone.
faster than acylation of benzene and gives a mixture containing mostly o- and p-fluoroacetophenone.
slower than acylation of benzene and gives a mixture containing mostly o- and p-fluoroacetophenone.
slower than acylation of benzene and gives mostly m-fluoroacetophenone.
a.faster than acylation of benzene and gives mostly m-fluoroacetophenone.
b.faster than acylation of benzene and gives a mixture containing mostly o- and p-fluoroacetophenone.
c.slower than acylation of benzene and gives a mixture containing mostly o- and p-fluoroacetophenone.
d.slower than acylation of benzene and gives mostly m-fluoroacetophenone.
CoHsExplanation / Answer
Solution :- Fluorine is most electronegative element therefore when it is attached to the benzene ring then it shows -I effect and acts as ring deactivating group.
thereofre acylation of the fluorobenzene ring will takes place at meta position. Also since F acts as deactivating group therefore the rate of the reaction of the fluorobenzene will be less than rate of the acylation of benzene.
therefore correct answer is option = 'd'
that is - slower than acylation of benzene and gives mostly m-fluoroacetophenone.