Used primarily as a chlorinating and oxidizing agent in organic synthesis. It facilitates the introduction of chlorine atoms into organic molecules, especially in the preparation of chlorinated derivatives of alkanes, alkenes, and aromatic compounds. Commonly employed in the synthesis of pharmaceuticals, agrochemicals, and fine chemicals where selective chlorination is required. It is also utilized in the formation of chlorohydrins from alkenes and in the oxidation of secondary amines to nitrosamines. Due to its reactivity, it is handled with care under controlled conditions to avoid decomposition or side reactions.