Question
What happens when propionic acid reacts with thionyl chloride?
Solution
Propionyl chloride is formed when propionic acid reacts with thionyl chloride.
CH3CH2COOH + SOCl2 → CH3CH2COCl + SO2 + HCl
CH3CH2COOH + SOCl2 → CH3CH2COCl + SO2 + HCl