Which of the following is not a disproportionation reaction?

Options

1. A$\mathrm{P}_{4}+5 \mathrm{OH}^{-} \longrightarrow \mathrm{H}_{2} \mathrm{PO}_{2}^{-}+\mathrm{PH}_{3}$
2. B$\mathrm{Cl}_{2}+\mathrm{OH}^{-} \longrightarrow \mathrm{Cl}^{-}+\mathrm{ClO}$
3. C$2 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}$
4. D$\mathrm{PbO}_{2}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{PbO}+\mathrm{H}_{2} \mathrm{O}_{2}$