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C-H bond enthelpy of halogenated hydrocarbons
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[QUOTE="docnet, post: 6469405, member: 677503"] I don't know the definitive answer, but there are some properties that may help you explain the case with F. The following data taken from [I]Inorganic Chemistry by Miessler.[/I]Halogen, electron affinity, ##\Delta## H of dissociation F, 328, 158 Cl, 349, 242 Br, 325, 192 I, 295, 151 At, 270A few notes about F from text: it is likely that the weakness of the F-F bond is largely a consequence of the repulsions between the nonbonding electron pairs. the small size of the fluorine atom brings these pairs into close proximity when F-F bonds are formed. Electrostatic repulsions between these pairs on neighboring atoms result in weaker bonding and an equilibrium bond distance significantly greater than would be expected in the absence of such repulsions. [/QUOTE]
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C-H bond enthelpy of halogenated hydrocarbons
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