In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it ?
(1) HF < HCl < HBr < HI : Increasing acidic strength
(2) H2O < H2S < H2Se < H2Te : Increasing pKa values
(3) NH3 < PH3 < AsH3 < SbH3 : Increasing acidic character
(4) CO2 < SiO2 < SnO2 < PbP2 : Increasing oxidizing power