The bond dissociation energy is highest for

$O_2$ is formed in the hydrolysis of:

Which of the following is not a peroxy acid?

The correct order of reactivity of halogens is

$MnO_{2} + HCl \xrightarrow{\Delta} A_{(g)}$
$A_{(g)} + F_{2} (\text{excess}) \rightarrow B_{(g)}$
$B_{(l)} + U_{(s)} \rightarrow C_{(g)} + D_{(g)}$
The gases $A$,$B$,$C$ and $D$ are respectively

Which of the following is the strongest acid?