Conceptual Checkpoint 18.07: Friedel-Crafts alkylation is an electrophilic aromatic substitution in which the electrophile (E+) is a carbocation. Forming carbocations can be done by other methods such as protonation of an alkene using strong acid. The resulting carbocation can also be attacked by a benzene ring, resulting in alkylation of the aromatic ring. Draw the mechanism for the following transformation.
For the mechanism, draw the curved arrows as needed. Include lone pairs and charges in your answer. Do not draw out any hydrogen explicitly. Your products should not use abbreviations such as H2SO4.
Question: Which of the four mechanistic steps shown is this step in the mechanism?
Draw the step of the mechanism.