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

1. acidic, Zn $-\mathrm{Hg}$
2. alcoholic, $\mathrm{Na}_2 \mathrm{SO}_3$
3. saturated aqueous, $\mathrm{NaHSO}_3$
4. aqueous, $\mathrm{NaCl}$

Asked in: AP EAMCET 2003

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