Dichlorofluoromethane

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Dichlorofluoromethane or Freon 21 or R 21 is a halomethane or hydrochlorofluorocarbon with the formula CHCl2F. It is a colorless and odorless gas. It is produced by fluorination of chloroform using a catalyst such as antimony trifluoride:

Excerpt from the Wikipedia article “Dichlorofluoromethane”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Tomaxer at English Wikipedia, Public domain, via Wikimedia Commons.