Which of the following statements regarding $H_2O_2$ is correct?

All the products formed in the oxidation of $NaBH_4$ by $I_2$ are

What product is formed when $I_2$ reacts with $H_2O_2$ in a basic medium?

Fill in the blanks:
$(1)$ $H_2O_2$ acts as an antiseptic, then it is known as ......... in the market.
$(2)$ Cation exchange resin is a ......... group containing organic molecule.
$(3)$ The ionic radius of $H^+$ ions and that of other ions is ......... $pm$ and ......... $pm$ respectively.
$(4)$ ......... group elements give salt-like hydrides.

The dihedral angles in gaseous and solid phases of $H_2O_2$ molecule respectively are

Assertion : Anhydrous $BaO_2$ is used for preparing $H_2O_2$.
Reason : Hydrated $BaO_2$ is not available.