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(A) The energy required for homolytic bond fission (bond dissociation energy) is inversely proportional to the stability of the resulting free radical

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$H_a$

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(A) The energy required for homolytic bond fission (bond dissociation energy) is inversely proportional to the stability of the resulting free radical.$1$. Homolysis of $H_a$ gives an allylic free radical,which is stabilized by resonance.$2$. Homolysis of $H_b$ gives a vinylic free radical,which is highly unstable due to the $sp^2$ hybridized carbon.$3$. Homolysis of $H_c$ gives an allylic free radical,which is also stabilized by resonance.Comparing $H_a$ and $H_c$,$H_a$ is attached to a carbon that is allylic to the double bond,and the resulting radical is resonance-stabilized. $H_c$ is also allylic. However,looking at the structure,the radical formed at $H_a$ is more stable due to extended conjugation with the ring system. Thus,the $C-H_a$ bond requires the minimum energy to break.

What is the minimum energy required for the homolytic bond fission of the $C-H$ bond in the following molecule?

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