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

$\displaystyle \mathrm{NH}_3<\mathrm{PH}_3<\mathrm{AsH}_3<\mathrm{SbH}_3$ : increasing acidic character

$\displaystyle \mathrm{CO}_2<\mathrm{SiO}_2<\mathrm{SnO}_2<\mathrm{PbO}_2$ : increasing oxidising power.

$\displaystyle \mathrm{HF}<\mathrm{HCl}<\mathrm{HBr}<\mathrm{HI}$ : increasing acidic strength

$\displaystyle \mathrm{H}_2 \mathrm{O}<\mathrm{H}_2 \mathrm{~S}<\mathrm{H}_2 \mathrm{Se}<\mathrm{H}_2 \mathrm{Te}$ : increasing $\displaystyle \mathrm{pK}_{\mathrm{a}}$ values