In which of the following arrangements, the sequence is not strictly according to the property written against it?

1. A
   ${\text{CO}}_2<{\text{SiO}}_2<{\text{SnO}}_2<{\text{PbO}}_2$ : increasing oxidising power
2. B
   $\text{HF}<\text{HCl}<\text{HBr}<\text{HI}$ : increasing acid strength
3. C
   ${\text{NH}}_3<{\text{PH}}_3<{\text{AsH}}_3<{\text{SbH}}_3$ : increasing basic strength
4. D
   $\text{B}<\text{C}<\text{O}<\text{N}$ : increasing first ionization enthalpy