Propanal can react with hydrogen cyanide to make 2-hydroxybutanenitrile. Sodium cyanide is a suitable catalyst for this reaction. $\text{CH}_3\text{CH}_2\text{CHO} + \text{HCN} \rightleftharpoons \text{CH}_3\text{CH}_2\text{CH(OH)CN}$
- A1, 2 and 3
- B1 and 2 only
- C2 and 3 only
- D1 only