$P_4 + 3NaOH + 3H_2O \to 3NaH_2PO_2 + PH_3$ is an example of

Assign $A, B, C, D$ from the given type of reaction.
$H_3PO_3 \xrightarrow{\Delta} H_3PO_4 + PH_3 \uparrow$

Which of the following behaves as both an oxidising and a reducing agent?

Disproportionation products of one mole of $MnO_4^{2-}$ in aqueous acidic medium are

The species given below that does $NOT$ show disproportionation reaction is :

The reaction $Cl_2 + 2OH^{-} \to ClO^{-} + Cl^{-} + H_2O$ represents the process of bleaching. Identify and name the species that bleaches the substances due to its oxidising action.