Interpretation:
For each of the molecules shown here, the weakest C-H bond is to be indicated.
The weaker of those two C-H bonds is to be determined and the reason for it is to be explained.
Concept introduction:
Although free radicals tend to be very unstable, we can assign different relative stabilities to various radicals, based on the energy required to produce them via homolysis. Alkyl radical stability increases in the order:
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