Perfluoroisobutene

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What Wikipedia says

Perfluoroisobutene (PFIB) is the perfluorocarbon with the formula (CF3)2C=CF2. Classified as a perfluoroalkene, it is the fluorinated counterpart of the hydrocarbon isobutene. This colorless gas is notable for its high toxicity.

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

Image: Leyo, Public domain, via Wikimedia Commons.