Question

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

1) CO₂ < SiO₂ < SnO₂ < PbO₂ (increasing oxidizing power) 

2) HF < HCl < HBr < HI (increasing acid strength) 

3) NH₃ < PH₃ < AsH₃ < SbH₃ (increasing basic strength) 

4) B < C < O < N (increasing first ionisation enthalpy)

Answer 1

3) NH₃ < PH₃ < AsH₃ < SbH₃ (increasing basic strength)