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Carbon dioxide (CO2), ethylene (C2H4), acetone (C3H6O), acetic acid (CH3COOH) are just a few.

Alkenes are an entire class of molecules that contain only carbon and hydrogen and have a double bond in them (a carbon-carbon double bond).

Other groups of molecules that have double bonds are ketones, which have a carbon-oxygen double bond.

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Q: What are some substances that have a double covalent bond?
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