Oxidising agents are substances that help other substances lose electrons, resulting in a chemical reaction called oxidation. In other words, oxidising agents add oxygen or remove hydrogen from a substance. Examples of oxidising agents include potassium permanganate (KMnO4), potassium dichromate (K2Cr2O7), and oxygen gas (O2). These agents are commonly used in chemical reactions to convert one substance into another.

Extra Explanation: Oxidising agents play a crucial role in many chemical reactions, including the conversion of alcohols to carboxylic acids. They help facilitate the transfer of electrons, allowing the reaction to occur.