How many of the compounds listed below give a carboxylic acid when heated under reflux with hot acidified $\text{K}_2\text{Cr}_2\text{O}_7$? $\text{CH}_3\text{CH}_2\text{CHO}$ $\text{CH}_3\text{COCH}_3$ $\text{CH}_3\text{CH}_2\text{CH}_2\text{OH}$ $\text{CH}_3\text{CHOHCH}_3$
- A1
- B2
- C3
- D4