The halogenation of methane in the gas phase is an industrial method for the preparation of certain

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The halogenation of methane in the gas phase is an industrial method for the preparation of certain alkyl halides and takes place by the following equation (X = halogen):X + CH4 HC-X + H-X

(a) This reaction takes place readily when X = Br or X = Cl, but not when X =

i. Show that these observations are expected from the ΔH° values of the reactions. Calculate the ΔH° values from appropriate bond dissociation energies.

(b) Explain why samples of methyl iodide (H3C—I) that are contaminated with traces of HI darken with the color of iodine on standing a long time.

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Organic Chemistry

ISBN: 9781936221349

6th Edition

Authors: Marc Loudon, Jim Parise

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