There are several different types of chemical reactions and more than one way of classifying them. If you're asked the five main types of reactions, it is these four and then either acid-base or redox (depending who you ask). Let's look at the reaction of hydrogen bromine (HBr) and propene (C_3H_6). Alkenes contain the unsaturated C=C functional group which characteristically undergo addition reactions. Bromine hogs the electrons in the HBr bond, thus making the hydrogen slightly positive and the bromine slightly negative. In a substitution reaction, generally, one atom or a group of atoms take place of another atom or a group of atoms which leads to the formation of an altogether new substance. This product will contain all the atoms that were present in the reactants. We will study three main types of reactions - addition, elimination and substitution. An example of a combustion reaction is the burning of naphthalene:C10H8 + 12 O2 → 10 CO2 + 4 H2O. In a nucleophilic substitution reaction, the nucleophile must have a pair of electrons and also should have a high affinity for the electropositive … Cycloadditions reactions. 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