Question

Which of the following is a disproportionation reaction?

• A. ${Cu}_{2}O+2H^{\oplus }⟶Cu+{Cu}^{2+}+H_{2}O$
• B.
  $2Cr{O}_4^{2-}+2H^{\oplus }⟶{Cr}_2{O}_7^{2-}+H_{2}O$
• C. $CaC{O}_3+2H^{\oplus }⟶{Ca}^{2+}+H_{2}O+C{O}_2$
• D. ${Cr}_2{O}_7^{2-}+2\stackrel{\ominus }{O}H⟶2Cr{O}_4^{2-}+H_{2}O$

Answer 1

The correct option is A ${Cu}_{2}O+2H^{\oplus }⟶Cu+{Cu}^{2+}+H_{2}O$

Disproportionation is a specific type of redox reaction in which a species is simultaneously reduced and oxidised to form two different products.
${Cu}_{2}O+2H^{\oplus }⟶Cu+{Cu}^{2+}+H_{2}O$