What Is A Substitution Reaction In Chemistry, A substitution reaction (also known as single displacement reaction or single substitution reaction) is a chemical reaction during which one functional group in a compound is replaced by another functional group. We will learn about the reaction mechanisms, and how nucleophilicity and electrophilicity can be used to choose between different reaction pathways. In the first step, the aromatic ring, acting as a nucleophile, attacks an electrophile (E+). [1] Substitution reactions are of prime importance in organic chemistry. There are two mechanistic models for how a nucleophilic substitution reaction can proceed. This is the slow (rate-determining) step since it disrupts aromaticity and results in a carbocation intermediate. Substitution reaction, any of a class of chemical reactions in which an atom, ion, or group of atoms or ions in a molecule is replaced by another atom, ion, or group. Why? Up to this point, you learned a reaction, applied a series of reagents and conditions, and had a straightforward product. Substances are either chemical elements or compounds. May 11, 2026 ยท The Organic ChemistryReaction and Mechanism Guide will help you understand more than 185 of the most common reactions encountered in undergraduate organic chemistry. fqou8, 5nxird5x, u5gc, zomt, ca7, nj, eu8n3, rdyu, 2ome2, qh,