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a) The oligomer 5 is obtained from the benzylic carbenium monomer and the dimer 2. b) The HOMO of 5 and the LUMO of methoxybenzyl carbenium ion that yield tetramer 8. c) The HOMO of 2 and the LUMO of the charged carbenium dimer that yield 8. d) According to the graph, three possible routes could lead to 8. The energy difference between the HOMO of the neutral species and the LUMO of the trimer carbenium is ΔEHOMO-LUMO = 1.06 eV; therefore, this interaction is more feasible.
