and write the name of each. their structures 2 2 Explain the following results: (e) in the absence of ight, toluene does o enzene presence of light, reaction time is 300 sec; in the presence of light reacts with bromine; reaction time for this reaction is 15 sec. not react with bromine; in the isopropylbenzene (cunene) also 23. Chlorination of propane proceeds predorminately via a secondary radical. (a) calculate delta H (G) well as (c) degree for the net reaction; and (b) delta H (G) degree for each chain propagation step; as eed it any for the two chain propagation steps, showing reactants, reactive intermediates and products. and give the general mode of quenching action for Vitamin C. the energy needed it amy delta H (G) degree for the combined two chain propagation steps; also calcn to sustain the reaction; and finally, construct a potential energy diagram (PED) based on bond energies 2.4. Vitamins C, Vitamin E and BHT are known as radical quenchers or antioxdants. Draw their structures a) Draw the structures of the monomer units that can be used to form Nitrile rubber, Saran and Butyl rubber. (b) What is the mechanism for their formation? 25. (b) between an electrophilic addition reaction and a nucleophilic addition reaction in terms of the substrate, and give three (3) examples of each. 2 6. Distinguish: (a) between an electrophile and a nucleophile, and give five (5) structural examples of each