Carbon monoxide,is a colorless, odorless and tasteless gas, which is highly toxic to humans and animals. It consists of one carbon atom and one oxygen atom, connected by a covalent double bond and a dative covalent bond. It is the simplest oxocarbon, and is an an hydride of formic acid.

Hydrogen cyanide,also know as Prussic acid, is a chemical compound with chemical formula HCN. Hydrogen cyanide is a colorless, extremely poisonous liquid that boils slightly above room temperature at 26 °C (78.8 °F). Hydrogen cyanide is a linear molecule, with a triple bond between carbon and nitrogen. A minor tautomers of HCN is HNC, Hydrogen isocyanide.

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Carbon Monoxide is a poisonous, tasteless, invisible, odorless gas, also known as the "silent killer." This gas is slightly lighter than air, and consists of one carbon atom and one oxygen atom, connected by a triple bond that consists of two covalent bonds as well as one dative convalent bond. It's the simplest oxocarbon. In coordination complexes the carbon monoxide ligand is called carbonyl.

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carbon monoxide is made up of carbon and oxygen (CO).

Carbon monoxide (CO), also called carbonic oxide, is a colorless, odorless and tasteless gas which is lighter than air. It is highly toxic to humans and animals in higher quantities, although it is also produced in normal animal metabolism in low quantities, and is thought to have some normal biological functions.

It consists of one carbon atom and one oxygen atom, connected by a covalent double bond and a dative covalent bond. It is the simplest oxocarbon, and is an anhydride of formic acid. In coordination complexes the carbon monoxide ligand is called carbonyl.

Carbon monoxide is produced from the partial oxidation of carbon-containing compounds; it forms when there is not enough oxygen to produce carbon dioxide (CO2), such as when operating a stove or an internal combustion engine in an enclosed space. Carbon monoxide burns with a blue flame, producing carbon dioxide.[1]