67. Solving a chemistry problem

8. The reaction A1 A2 \u003d B1 B2 proceeds according to a chain unbranched mechanism. The nucleation of the chain occurs as a result of the interaction of a light quantum with one of the reacting components or through thermal action. Assuming that the chain propagation reaction proceeds through two elementary stages, and the chain death occurs on one of the free radicals involved in the process, write down:
1) Diagram of the proposed chain reaction mechanism;
2) Stoichiometric chain reaction equation using chain length value ν;
3) Kinetic equation for the studied reaction based on the proposed mechanism. Show that, depending on the nature of the free radical on which chain death occurs, the reaction is described by various kinetic equations;
4) How many A1 molecules are consumed and how many B1 molecules are formed in the chain if the chain length ν (see table)
Option No. Reaction Substance with which a quantum of light interacts or thermal decay occurs Chain length ν Free radical on which chain death occurs Molecule that decomposes Molecule that forms T, K
8 CO Cl2 COCl2
Cl2 300 Cl CO COCl2 300
* The problem is taken from Kudryashov Ch. XXV