Which one of the following does $NOT$ readily give oxygen upon heating?

The concentration of commercial $H_2O_2$ is $3.125 \ M$,then its grade is $..........$ volume.

$A$ colourless liquid $A$ contains $H$ and $O$ elements only. It decomposes slowly on exposure to light. It is stabilised by mixing urea to store in the presence of light.
$(i)$ Suggest the possible structure of $A$.
$(ii)$ Write the chemical equation for its decomposition reaction in light.

The volume strength of perhydrol is

The strengths of $5.6$ volume hydrogen peroxide (of density $1 \ g/mL$) in terms of mass percentage and molarity $(M)$,respectively,are:
(Take molar mass of hydrogen peroxide as $34 \ g/mol$)

During which of the following reactions will a gaseous product $NOT$ be produced?