a.Oxygen has a tendency to form pπ-pπ multiple bond due to absence of d-orbitals and high bond dissociation enthalpy. So, dioxygen exists as a gas. But on the other hand Sulphur has tendency to form single bond due to the presence of d-orbitals and thus exists in polyatomic (S8)form.
b. NO (g) released by jet aeroplanes is slowly depleting the ozone layer because it reacts with ozone to form NO2 and O2
NO + O3 → NO2 + O2
c. Interhalogens are more reactive than pure halogens because interhalogen bonds are weaker than bonds in pure halogens, i.e., X -X' bond is weaker than X-X bond
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