Which of the following represents the correct order of increasing $p{K}_{a}pK\_a$ values of the given acids?

In which case, the order of acidic strength is not correct?

The relative basic character of the following is

The correct order of acidic strength is

The correct order of bond energy is

$HCl{O}_4,HN{O}_{3}HClO\_4,HNO\_3$ and HCl are all very strong acids in aqueous solution. In glacial acetic acid medium, their acid strength varies in the order as

The electronegativity follows the order

In the oxoacids of chlorine Cl-O bond contains

The correct order of electron gain enthalpy values $(\mathrm{\Delta }H)(\backslash Delta\; H)$ of the halogen atoms is

Which of the following sets has strongest tendency to form anions?