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2

Your question stays fuzzy, and the addition of the scheme does not add much clarification. The arrow between mesomers is not the one about a reaction, nor about a chemical equilibrium. (Typically, R and R' designate substituents at the periphery of a chain, or a cyclic core structure; but not about what different spaces within a chain. This just as a side ...


4

Yes, $\ce{FeCl3}$ is a well known Lewis acid that is used in place of $\ce{AlCl3}$ for FC reaction. See the paper linked by user55119 and also this question. Other $\ce{MX_n}$ types of reagents used in FC reactions are $\ce{BF3}$, $\ce{BeCl2}$, $\ce{TiCl4}$, $\ce{SbCl5}$, $\ce{SnCl4}$, $\ce{SeCl4}$, $\ce{TeCl4}$, $\ce{InCl3}$, $\ce{NbCl5}$, $\ce{IrCl3}$ or $\...


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