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In chemistry, a cyanide (from Greek kyanos 'dark blue') is a chemical compound that contains a C≡N functional group. This group, known as the cyano group, consists of a carbon atom triple-bonded to a nitrogen atom.
In inorganic cyanides, the cyanide group is present as the anion −C≡N. Soluble salts such as sodium cyanide (NaCN) and potassium cyanide (KCN) are highly toxic. Hydrocyanic acid, also known as hydrogen cyanide, or HCN, is a highly volatile liquid that is produced on a large scale industrially. It is obtained by acidification of cyanide salts.
Organic cyanides are usually called nitriles. In nitriles, the C≡N group is linked by a covalent bond to carbon. For example, in acetonitrile (CH3−C≡N), the cyanide group is bonded to methyl (−CH3). Although nitriles generally do not release cyanide ions, the cyanohydrins do and are thus rather toxic.
Scotch broth is a soup, originating in Scotland. The principal ingredients are usually barley, stewing or braising cuts of lamb, mutton or beef, root vegetables (such as carrots, swedes, or sometimes turnips), and dried pulses (most often split peas and red lentils). Cabbage and leeks are often added shortly before serving to preserve their texture, colour and flavours. The proportions and ingredients vary according to the recipe or availability. Scotch broth has been sold ready-prepared in tins for many years.