Which of the following compounds is used to convert acetaldehyde into acetaldehyde cynanohydrin?

1. $\mathrm{FeCl}_3$ (neutral)
2. $\mathrm{H}_2 \mathrm{SO}_4$ (dil.)
3. HCN
4. $\mathrm{NaHSO}_3$

Asked in: MHT CET 2024 (09 May Shift 1)

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