In general correct decreasing order of thermal stability of oxides formed by halogens

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I > Br > Cl

I > Cl > Br

I < Br < Cl

I < Cl < Br

answer is B.

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Detailed Solution

Higher stability of oxides of iodine is due to greater polarisability of bond between iodine and oxygen. In the case of chlorine, multiple bond formation between chlorine and oxygen takes place due to availability of d–orbitals. This leads to increase in stability. Bromine lacks both the
characteristics hence stability of oxides of bromine is least.

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