6. Thermodynamics and Kinetics
Enthalpy
12:16 minutes
Problem 4c
Textbook Question
Textbook QuestionIodination of alkanes using iodine (I2) is usually an unfavorable reaction. (See Problem 4-17 , for example.) Tetraiodomethane (CI4) can be used as the iodine source for iodination in the presence of a free-radical initiator such as hydrogen peroxide. Propose a mechanism (involving mildly exothermic propagation steps) for the following proposed reaction. Calculate the value of ΔH for each of the steps in your proposed mechanism.
+ Cl4 —> H2O2 heat —> + HCl3 The following bond-dissociation energies maybe helpful: I3C—I 188 kJ/mol (45 kcal/mol) HO—I 234 kJ/mol (56 kcal/mol) I3C—H 418 kJ/mol (100 kcal/mol) HO—OH 213 kJ/mol (51 kcal/mol) 413 kJ/mol (99 kcal/mol) 238 kJ/mol (57 kcal/mol)Verified Solution
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