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Classification of reactions 1-Addition reaction: This is where atoms or groups of atoms are added to the substrate. In general, we will have additions when the substrate has double or triple bonds. 2- Elimination reaction - This is where atoms or groups of atoms are removed from the substrate. In general, in eliminations, we will have the formation of double or triple bonds. 3- Substitution reaction - This is where an atom or a group of atoms of the substrate is replaced by another atom or group of atoms. OXIDATION: loss of electrons = increase in nox. It is generally evidenced by the entry of oxygen. REDUCTION: Gain of electrons = decrease in nox. It is generally evidenced by the entry of hydrogen (exit of oxygen).