In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

1. A. H2O < H2S < H2Se < H2Te : Increasing pK a values
2. B. NH3 < PH3 < AsH3 < SbH3 : Increasing acidic character
3. C. CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing power
4. D. HF < HCl < HBr < HI : Increasing acidic strength

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