Cyanogen gas is obtained in the reaction:

  • A
    $CuSO_{4(aq)} + KCN \to$
  • B
    $K_4[Fe(CN)_6] \xrightarrow{\text{heat}}$
  • C
    $CH_3CN + H_2O \xrightarrow{\Delta}$
  • D
    $CH_3CONH_2 + P_2O_5 \xrightarrow{\Delta}$

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