This description applies to electrophilic aromatic substitution in which the aromatic ring is the nucleophile and the added group is the electrophile.
Electrophiles are entities that lack electrons and are drawn to an electron-rich center. In order to create a bond with a nucleophile, involving the interactions of a proton and a base, electrophiles react by accepting an electron pair because they contain an atom with a positive charge or an atom without an octet of electrons, electrophiles are frequently positively charged. Lewis acids (compounds that receive electron pairs) are electrophilic chemicals, and many of them are Bronsted acids (compounds that donate protons).
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