Question

The acylation of benzene is called reaction.
A.KeWa
B.Wurtz
C.Friedel and craft
D.None of the above

Answer 1

Hint: Benzene is one of the most important organic compounds with the chemical formula ${C_6}{H_6}$ .It is also the parent compound of various aromatic compounds. Moreover, it undergoes various reactions including acylation.

Complete step by step answer:
A friedel-crafts reaction is an organic coupling reaction involving an electrophilic aromatic substitution that is used for the attachment of substituents to aromatic rings. Further, there are two types of Friedel-crafts reaction:
-Friedel crafts alkylation
-Friedel crafts acylation
However, benzene undergoes friedel crafts acylation but we will discuss both the primary types.
-Friedel crafts Acylation- This electrophilic aromatic substitution basically allows the synthesis of monoacylated products from the reaction between arenes and acyl chlorides or anhydrides. Further, the products are deactivated and do not undergo a second substitution. The reaction is as shown:

Friedel crafts alkylation- It refers to the replacement of an aromatic proton with alkyl group. This is done through an electrophilic attack on the aromatic ring with the help of carbocation. It is basically a method of generating alkyl benzenes by using alkyl halides as reactants. The reaction is as shown:

Hence, option C is correct.

Note:
The friedel crafts acylation reaction has few shortcomings. This reaction only yields ketones. This is because formyl chloride decomposes into CO and HCl when exposed to these conditions. Moreover the aromatic compounds cannot participate in this reaction if they are less reactive than a mono-halo benzene and aryl amines cannot be used because they form highly unreactive complexes with Lewis acid catalyst.