Thank you for letting me know!
This is what I have tried so far:
The chloride from the t-butyl will react with the FeBr3, forming a bond between Iron and Chloride. The Cl will have a positive charge and the Iron will have a negative charge. After that, I want to "kick out" the Cl-FeBr3 and end up with the carbocation of t-butyl. That is where I am stuck. Can one of the bromines from the FeBr3 react with the carbocation? Or will the carbocation react with the benzene?
For the second question. I think that the HCl comes from an Elimination reaction, but I am not 100% sure. I am thinking of 2 t-butyl chrlorides reacting. One becomes the carbocation after the Cl leaves. The second t-butyl will take a Hydrogen from the carbocation, and form a double bond (elimination), thus forming HCl.Am I on the right track?