hydrogen bromide
Noun
Meaning
a colorless gas that yields hydrobromic acid in solution with water
Source: WordNetSynonyms
Hypernyms
Examples
An alternative reaction is between protactinium pentachloride and hydrogen bromide or thionyl bromide.
Brückner, p. 172 Electrophilic addition of hydrogen bromide The counterpart of elimination is the addition where double or triple bonds are converted into single bonds.
The first stage is formation of hydrogen bromide (HBr), a gas, and some of the HBr is further oxidized by the sulfuric acid to form bromine (Br 2 ) and sulfur dioxide (SO 2 ).
This is usually done using "chemical intuition": in the above example, hydrogen bromide dissolves in water to form H + and Br − ions, so it may be assumed that bromine is more electronegative than hydrogen.
Why hydrogen bromide exhibited both Markovnikov as well as reversed-order, or anti-Markovnikov, addition, however, was not understood until Morris S. Kharasch offered an explanation in 1933.