Diketene

Acetyl ketene freezes at 20 degrees F.

Chemical Formula: C₄H₄O₂

Other names: 3-Buteno-b-lactone

Layman's explanation: Acetyl ketene is a clear and colorless liquid with a pungent odor. It reacts with water releasing heat, and is also soluble in water. It is very flammable. Vapors of acetyl ketene are heavier than air and will collect and stay in low areas.

Keywords: flammable, pungent odor

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