Which of the following change represents a disproportionation reaction(s)

• A

  ${\mathrm{Cl}}_2+2{\mathrm{OH}}^{-}⟶{\mathrm{ClO}}^{-}+{\mathrm{Cl}}^{-}+{\mathrm{H}}_2\mathrm{O}$

• B

  ${\mathrm{Cu}}_2\mathrm{O}+2{\mathrm{H}}^{+}⟶\mathrm{Cu}+{\mathrm{Cu}}^{2+}+{\mathrm{H}}_2\mathrm{O}$

• C

  $2{\mathrm{HCuCl}}_2\underset{\mathrm{water}}{\overset{\mathrm{dilution}with}{\to }}\mathrm{Cu}+{\mathrm{Cu}}^{2+}+4{\mathrm{Cl}}^{-}+2{\mathrm{H}}^{+}$

• D

  ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3+{\mathrm{Cl}}_2+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{Na}}_2{\mathrm{SO}}_4+\mathrm{S}+\mathrm{HCl}$