In chemistry, cyanide (from the Greek kyanos "dark blue") is a compound containing a C≡N functional group. This group is called a cyano group and consists of a carbon atom triple bonded to a nitrogen atom. 

In inorganic cyanides, the cyanide group exists as the cyanide anion -C≡N. This negative ion is highly toxic. Soluble salts such as sodium cyanide (NaCN) and potassium cyanide (KCN) are highly toxic. [2] Hydrocyanic acid, also known as hydrogen cyanide formula or HCN, is a highly volatile liquid that is produced industrially in large quantities. From cyanide hydrochloride in the system.

Organic cyanides are commonly referred to as nitriles. In nitriles, the -C≡N group is attached to carbon via a single covalent bond. For example, in acetonitrile (CH3-C≡N), the cyanide group is bonded to a methyl group (-CH3). While nitriles do not normally release cyanide ions, cyanohydrins do, and are therefore toxic.

bonding
Cyanide ion -C≡N and carbon monoxide -C≡O+ and molecular nitrogen N≡N and other electrons. There is a triple bond between C and N. The negative charge is concentrated on carbon C.

Nigeria removes cyanide from cassava.
Cyanide is produced by certain bacteria, fungi and algae. It is an antifeedant for many plants. Large amounts of cyanide are found in certain seeds and pits, such as bitter almonds, apricots, apples and peaches. [5] Compounds that release cyanide are called cyanogenic compounds. In plants, cyanide, usually in the form of cyanogenic glycosides, binds to sugar molecules and protects plants from herbivores. Cassava root (also known as cassava), an important potato-like food grown in tropical countries (and the basis for making tapioca flour), also contains cyanogenic glycosides. [6][7]

The bamboo Cathariostachys madagascariensis in Madagascar produces cyanide to deter grazing. In response, the bamboo-eating golden bamboo lemurs developed a high tolerance to cyanide.

Hydrogenases contain cyanide ligands that are attached to iron at their active sites. Cyanide biosynthesis in NiFe hydrogenase from carbamoyl phosphate, which is converted to cysteinyl thiocyanate, CN-donor