For ${\mathrm{I}}_2+2\mathrm{e}\to 2{\mathrm{I}}^{-}$, standard reduction potential = + 0.54 volt. For $2{\mathrm{Br}}^{-}\to {\mathrm{Br}}_2+2{\mathrm{e}}^{-}$, standard oxidation potential = – 1.09 volt. For $\mathrm{Fe}\to {\mathrm{Fe}}^{2+}+2{\mathrm{e}}^{-}$standard oxidation potential = + 0.44 volt. Which of the following reactions is non-spontaneous?

• A

  ${\mathrm{Br}}_2+2{\mathrm{I}}^{-}\to 2{\mathrm{Br}}^{-}+{\mathrm{I}}_2$

• B

  $\mathrm{Fe}+{\mathrm{Br}}_2\to {\mathrm{Fe}}^{2+}+2{\mathrm{Br}}^{-}$

• C

  $\mathrm{Fe}+{\mathrm{I}}_2\to {\mathrm{Fe}}^{2+}+2{\mathrm{I}}^{-}$

• D

  ${\mathrm{I}}_2+2{\mathrm{Br}}^{-}\to 2{\mathrm{I}}^{-}+{\mathrm{Br}}_2$