Which fo the following catalysts is employed in the Friedelcrafts acylation?
(i) `AlCl_(3)`
(ii). `BF_(3)`
(iii). `FeCl_(3)`
(iv). `ZnCl_(2)`

Options

A. (i),(iii)
B. (i),(iii),(iv)
C. (i),(ii),(iii),(iv)
D. (i),(ii),(iii)

Answer

3

Explanation

Like alkylation ,acylation also requires a lewis acid of the type `MX_(n)` most commonly `AlCl_(3)` but also `BF_(3)` `FeCl_(3)`, and `ZnCl_(2)` in acylation, a `1:1` complex of `RCOCl` and catalyst forms which then dissociates into the acylium ion: