In Solomons, Organic Chemistry, 11e,
Bond Broken energy for CH3CH2CH2─Cl and CH3CH2CH2─Br are 354 and 294 kJ mol−1, respectively.
However, for (CH3)2CH─Cl and (CH3)2CH─Br are 355 and 297 kJ mol−1, respectively.
The data not only inconsistent with the corresponding R-F and R-I trend, but also inconsistent with the stability of secondary radical and primary radical.
Why? Any good explanation?
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