Provide the balanced equation when nitrous acid (HNO₂) reacts with aniline (C₆H₅NH₂). What are the conjugate acid-base pairs? Use arrows showing which direction of the equilibrium is favored.
Refer to the following acidity: HCl > HNO₂ > HF > NH₄⁺ > C₆H₅NH₃⁺ > C₆H₅NH⁺

• A. HNO₂(aq) + CH₅NH₂(aq) ⥂ NO₂^–(aq) + C₆H₅NH₃⁺(aq)
  Acid: HNO₂; Conjugate base: NO₂^–
  Base: CH₅NH₂; Conjugate acid: C₆H₅NH₃⁺
• B. NO₂(aq) + CH₅NH₂(aq) ⥄ NO₂^–(aq) + C₆H₅NH₃⁺(aq)
  Acid: HNO₂; Conjugate acid: NO₂^–
  Base: CH₅NH₂; Conjugate base: C₆H₅NH₃⁺
• C. NO₂(aq) + CH₅NH₂(aq) ⥂ NO₂^–(aq) + C₆H₅NH₃⁺(aq)
  Acid: HNO₂; Conjugate base: NO₂^–
  Base: CH₅NH₂; Conjugate acid: C₆H₅NH₃⁺

Answer: (A)