$H_2O_2$ acts as an oxidising agent in

The correct increasing order of acidity is

Perhydrol is an aqueous solution of

Hydrogen peroxide is

What is the $O-O-H$ bond angle in the solid form of $H_2O_2$ (in $^{\circ}$)?

$(i)$ Draw the gas phase and solid phase structure of $H_2O_2$.
$(ii)$ $H_2O_2$ is a better oxidizing agent than water. Explain.