In which of the following arrangements, the sequence is not strictly according to the property

Question:

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

 

  1. $\mathrm{CO}_{2}<\mathrm{SiO}_{2}<\mathrm{SnO}_{2}<\mathrm{PbO}_{2}$ : increasing oxidising power

  2. $\mathrm{B}<\mathrm{C}<\mathrm{O}<\mathrm{N}$ : increasing first ionisation enthalpy

  3. $\mathrm{NH}_{3}<\mathrm{PH}_{3}<\mathrm{AsH}_{3}<\mathrm{SbH}_{3}$ : increasing basic strength

  4. $\mathrm{HF}<\mathrm{HCl}<\mathrm{HBr}<\mathrm{HI}$ : increasing acid strength


Correct Option: , 3

Solution:

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