hydrogen halide

…form compounds with hydrogen, the hydrogen halides. The energy of the hydrogen-halogen bond increases strongly from iodide to fluoride. Hydrogen fluoride in the crystalline state consists of infinite zigzag chains, as shown in the diagram, in which H represents the hydrogen atoms

…be salts of the respective hydrogen halides, which are colourless gases at room temperature and atmospheric pressure and (except for hydrogen fluoride) form strong acids in aqueous solution. Indeed, the general term salt is derived from rock salt, or table salt (sodium chloride). The tendency of the halogen elements to…

When a hydrogen halide adds to the carbon-carbon triple bond of an alkyne, addition of the first molecule is faster than the second, and a vinylic halide can be isolated.