Write the reaction equations: c2h2-c6h6 (c6h5no2) -c6h6cl6

We will carry out the solution, we will compose the equations for organic substances:
3C2H2 = C6H6 – the trimerization reaction occurs with the participation of a hot coal catalyst, benzene is formed;
С6Н6 + НNO2 = C6H5NO2 + H2O – benzene nitration, substitution reaction, nitrobenzene is released;
С6Н6 + 3Сl2 = C6H6Cl6 – addition of chlorine, hexachlorane was obtained.
These reactions confirm the connection between unsaturated and aromatic hydrocarbons. Substances obtained in the course of the reactions are of practical importance, for example, hexachlorane is used in agriculture as an insecticide.