Assign $A, B, C, D$ from the given type of reaction.
$NaNO_2 + FeSO_4 + H_2SO_4 \longrightarrow [Fe(H_2O)_5NO]SO_4 + Na_2SO_4 + Fe_2(SO_4)_3 + H_2O$
Identify the type of reaction for the formation of the brown ring complex.

  • A
    $A$. Disproportionation reaction.
  • B
    $B$. Comproportionation reaction.
  • C
    $C$. Intermolecular redox reaction.
  • D
    $D$. Thermal decomposition redox reaction.

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