Answer
Corey's reagent, also known as N-chlorosuccinimide (NCS), is a versatile synthetic reagent developed by Elias James Corey. It is commonly used in organic chemistry for the selective oxidation of alcohols to aldehydes or ketones. Corey's reagent is particularly useful for the oxidation of primary alcohols, which are typically difficult to oxidize without overoxidation to carboxylic acids.