(a) Propose a mechanism for the following reaction:

(b) Use the bond-dissociation enthalpies given in Table 4-2 (page 143) to calculate the value of (H( for each step shown in your mechanism. (The BDE for CH2= CHCH2 - Br is about 280 kJ/mol, or 67 kcal/mol.) Calculate the overall value of (H( for the reaction. Are these values consistent with a rapid free-radical chain reaction?

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