The kinetic data for the radical chain chlorination of several cycloalkanes (see the adjoining table) illustrate that the C-H bonds of cyclopropane and, to a lesser extent, cyclobutane are somewhat abnormal,
(a) What do these data tell you about the strength of the cyclopropane C-H bond and the stability of the cyclopropyl radical?
(b) Suggest a reason for the stability characteristics of the cyclopropyl radical.

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Reactivity per Hydrogen Toward CI Cycloalkane Cyclopentane Cyclobutane Cyclopropane Note: Relative to cyclohexane at 68°C, hv, CCl4 solvent. Reactivity 0.9 0.7 0.1 1.0;