Acetaldehyde forms a white crystalline precipitate on mixing with a ...... solution of

• A

  acidic, Zn $-\mathrm{Hg}$
• B

  alcoholic, $\mathrm{Na}_2 \mathrm{SO}_3$
• Correct answer
  C

  saturated aqueous, $\mathrm{NaHSO}_3$
• D

  aqueous, $\mathrm{NaCl}$

Hence, the correct answer is option: 'C'.