[Archy12345]

Nevermind this post. I figured it out.

[sjb]

Nevermind this post. I figured it out.

Why not post question and answer to help others that may pass this way in future?

[Archy12345]

That's a good point.

My question had to do with the last step of the process. Let's say you were making Chlorobenzene from Benzene and chlorine using Iron (III) Chloride as a catalyst.
I was confused as to which molecule/atom accepted the proton from the benzene ring. My problem was that if FeCl₃ accepted to proton then why would it not become CoCl₃. I was sure this way of thinking was wrong, and it was. The FeCl₃ donates its electron to a chlorine atom, and then the chlorine anion accepts the proton to make hydrogen chloride.

[Dan]

The proton (H⁺) does not enter the Fe nucleus.

FeCl₄^- + H⁺  FeCl₃ + HCl