a) What stage of the radical chain corresponds to these reactions: initiation, termination, orpropagation? b) Find the rate of consumption of 12, and the rate of production of ethene. Assume that allradical species are very reactive. How would you define the length of the radical chain? c) How much will the rate of ethene production change if the gas pressure is increased twice? If the light intensity is increased twice? How will this rate change qualitatively if you add to the mixture an aerosol of the same material from which the wall is made? d) Let the initial concentration of 1₂ be significantly lower than that of C₂H4l2, so that for the initial period of the reaction [C₂H412] can be assumed constant. Integrate the production rate of 12 to find [12](t). Sketch your solution.