When each compound below is heated under reflux with an excess of hot acidified $\text{K}_2\text{Cr}_2\text{O}_7$, how many yield a carboxylic acid? $\text{CH}_3\text{CH}_2\text{CHO}$ $\text{CH}_3\text{COCH}_3$ $\text{CH}_3\text{CH}_2\text{CH}_2\text{OH}$ $\text{CH}_3\text{CH(OH)CH}_3$
- A1
- B2
- C3
- D4