In which of the following arrangements the given sequence is not strictly according to the property indicated against it?
HF < HCl < HBr < HI : increasing acidic strength
H2O < H2S < H2Se < H2Te : increasing pKa values
NH3 < PH3 < AsH3 < SbH3 : increasing acidic character
CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power
