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Another likely correct answer that obeys the constraints of the equation: $\ce{X + O3 → Y + O2}$ and forms likely stable radicals (as opposed to your suggested answer noting this reference "On the stability of the elusive HO3 radical") for two members of the chain associated with an ozone depletion cycle which results in the net reaction: $\ce{2 ...


It is just a matter of energy of a single photon. Heterolytic cleavage of a symmetric bond requires more energy and can be less brobable, but see the totalitarian principle. E.g. the extreme UV (tens of eV per photon) can indiscriminately cleave any chemical bond both homolytically and heterolytically.

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