Final answer:
The Swern reagent (DMSO, (COCl2)/Et3N) is used for the oxidation of primary alcohols to aldehydes. It replaces the hydroxyl group with a double bond to an oxygen atom.
Step-by-step explanation:
The Swern reagent (DMSO, (COCl2)/Et3N) is a common reagent used for the oxidation of primary alcohols to aldehydes. The reaction involves the conversion of the primary alcohol to an aldehyde by replacing the hydroxyl group with a double bond to an oxygen atom. This reagent is often used when milder conditions are desired compared to other oxidizing agents like potassium dichromate or chromic acid.