Which one of the following does not undergo disproportionation reaction?

Statement-$1$ : $I_2 \rightarrow IO_3^- + I^-$; This is a disproportionation reaction.
Statement-$2$ : Oxidation number of $I$ can vary from $-1$ to $+7$.

Assign $A, B, C, D$ from the given type of reaction.
$S_8 + NaOH \longrightarrow Na_2S + Na_2S_2O_3$

When $P_4$ reacts with caustic soda,the products are $PH_3$ and $NaH_2PO_2$. This reaction is an example of

The reaction $2Cu^{+} \rightarrow Cu + Cu^{2+}$ is called:

In the following reaction,$4P + 3KOH + 3H_2O \to 3KH_2PO_2 + PH_3$,what happens to phosphorus $(P)$?