The thermal stability of oxy acids of chlorine increase on increasing of oxidation number of chlorine atom because on addition of additional oxygen atoms, the number of (pπ-dπ) π-bonds increase which provide extra stability to the molecules. Oxy acids of chlorine and their number of pπ-dπ bonds given as:
HOCI (0~Pπ-dπ)
HOCIO (1~Pπ-dπ)
HOClO2 (2~Pπ-dπ)
HOCIO3 (3~Pπ-dπ)
Thus the overall stability of oxy acids of chlorine are given as:
"HClO < HClO2 < HClO3 < HClO4"
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