After treatment with $\text{NaBH}_4$, which of these compounds gives a product that contains a chiral carbon atom? 1. $\text{CH}_3\text{CH}_2\text{CH}_2\text{COCH}_3$ 2. $\text{CH}_2\text{CHCOCH}_2\text{CH}_3$ 3. $\text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3$
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct