$\mathrm{Cu}^{+}(a q)$ is unstable in solution and undergoes simultaneous oxidation and reduction, according to the reaction $2 \mathrm{Cu}^{+}(a q) \rightleftharpoons \mathrm{Cu}^{2+}(a q)+\mathrm{Cu}(s)$ choose correct $E^{\circ}$ for above reaction if $E_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\circ}=0.34 \mathrm{~V}$ and $E_{\mathrm{Cu}^{2+} / \mathrm{Cu}^{+}}^{\circ}=0.15 \mathrm{~V}$

• A

  $-0.38 \mathrm{~V}$
• B

  $+0.49 \mathrm{~V}$ $(\mathrm{c})+0.38 \mathrm{~V}$
• Correct answer
  C

  $-0.19 \mathrm{~V}$
• D

  NULL

Hence, the correct answer is option: 'C'.