Reaction with phosphorus pentachloride (PCl5) is a characteristic of organic compounds containing a hydroxyl group and this reaction is used to identify these compounds in an organic analysis.
Generalic, Eni. "PCl5 reaction." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table