In which of the following arrangements, the sequence is not strictly according to the property written against it?
CO2 < SiO2 < SnO2 < PbO2 : Increasing oxidizing power
HF < HCl < HBr < HI : Increasing acid strength
NH3 < PH3 < AsH3 < SbH3 : Increasing basic strength
B < C < O < N : Increasing first ionization enthalpy