Determine the formation of the electrophilic reagent for the following electrophilic substitution reactions on an aromatic nucleus:
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→ Methylation
Indication: Reaction between aluminium chloride (electron gap!) and chloromethane
→ Nitration
Indication: Reaction between concentrated sulfuric acid and nitric acid followed by a water departure
→ Chloration
Indication: Reaction between aluminium chloride (electron gap!) and chlorine
→ Ethanoylation
Indication: Reaction between aluminium chloride (electron gap!) and ethanoyl chloride
