Hexafluoroacetone

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What Wikipedia says

Hexafluoroacetone (HFA) is a chemical compound with the formula (CF3)2CO. It is structurally similar to acetone; however, its reactivity is markedly different. It is a colourless, hygroscopic, nonflammable, highly reactive gas characterized by a musty odour.

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

Image: Fvasconcellos 01:23, 18 November 2007 (UTC), Public domain, via Wikimedia Commons.