Electrode potential data are given below :
$Fe^{3+}_{(aq)} + e^- \to Fe^{2+}_{(aq)}; \, E^o = +0.77 \, V$
$Al^{3+}_{(aq)} + 3e^- \to Al_{(s)}; \, E^o = -1.66 \, V$
$Br_{2(aq)} + 2e^- \to 2Br^{-}_{(aq)}; \, E^o = +1.08 \, V$
Based on the data given above,the reducing power of $Fe^{2+}$,$Al$ and $Br^{-}$ will increase in the order:

• A
  $Br^{-} < Fe^{2+} < Al$
• B
  $Fe^{2+} < Al < Br^{-}$
• C
  $Al < Br^{-} < Fe^{2+}$
• D
  $Al < Fe^{2+} < Br^{-}$