Question

explain substitution reactions, combustion reactions, hydrogenation reactions

Answer 1

substitution reaction is a reaction in which one elements exchange their ions.
combustion reaction is a reaction when two elements spilt into its constituent.
hydrogenation reaction is a reaction in which vegetable oil is converted into vanaspati ghee under high temperature using iron as a catalyst.

Answer 2

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. An example is the reaction in which the chlorine atom in the chloromethane molecule is displaced by the hydroxide ion, forming methanol

The process of hydrogenation involves the use of hydrogen molecules to saturate organic compounds, in the presence of a catalyst


Combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heatand light in the form of flame. The rate or speed at which the reactants combine is high, in part because of the nature of the chemical reaction itself and in part because more energy is generated than can escape into the surrounding medium, with the result that the temperature of the reactants is raised to accelerate the reaction even more.