(a) Propose a mechanism for the following reaction: (b) Use the bond-dissociati...

(a) Propose a mechanism for the following reaction:

(b) Use the bond-dissociation enthalpies given in Table 4-2 (page 143) to calculatethe value of for each step shown in your mechanism. (The BDE for is about 280 kJ/mol, or 67 kcal/mol.) Calculate the overallvalue of for the reaction. Are these values consistent with a rapid free-radicalchain reaction?