In organic chemistry, the bromine test is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds), phenols and anilines.
An unknown sample is treated with a small amount of elemental bromine in an organic solvent, being
as dichloromethane or carbon tetrachloride. Presence of unsaturation and/or phenol or aniline in the sample is shown by disappearance of the deep brown coloration of bromine when it has reacted with the unknown sample. The formation of a brominated phenol (i.e. 2,4,6-tribromophenol) or aniline (i.e. 2,4,6-tribromoaniline) in form of a white precipitate indicates that the unknown was a phenol or aniline. The more unsaturated an unknown is, the more bromine it reacts with, and the less coloured the solution will appear.[1]
Should the brown colour not disappear, possibly due to the presence of an alkene which doesn't react, or reacts very slowly with, bromine, the potassium permanganate test should be performed, in order to determine the presence or absence of the alkene.[2] The iodine value is a way to determine the presence of unsaturation quantitatively.
The bromine test is a simple qualitative test. Modern spectroscopic methods (e.g. NMR and infrared spectroscopy) are better at determining the structural features and identity of unknown compounds.
^"The Systematic Identification of Organic Compounds" R.L. Shriner, C.K.F. Hermann, T.C. Morrill, D.Y. Curtin, and R.C. Fuson John Wiley & Sons, 1997 ISBN 0-471-59748-1
In organic chemistry, the brominetest is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds), phenols and anilines...
well with bromine water are phenols, alkenes, enols, the acetyl group, aniline, and glucose. In addition, bromine water is commonly used to test for the...
acids, oximes, and sulfinic acids give positive results as well. The brominetest is useful to confirm the result, although modern spectroscopic techniques...
Bromine is a chemical element; it has symbol Br and atomic number 35. It is a volatile red-brown liquid at room temperature that evaporates readily to...
brominetest is used to test for the presence of unsaturation and phenols. Barium chloride tests for sulfates Acidified silver nitrate solution tests...
Bromine compounds are compounds containing the element bromine (Br). These compounds usually form the -1, +1, +3 and +5 oxidation states. Bromine is intermediate...
reactions do not require catalysts. Brominetest is used to test the saturation of hydrocarbons. The brominetest can also be used as an indication of...
Bromine pentafluoride, BrF5, is an interhalogen compound and a fluoride of bromine. It is a strong fluorinating agent. BrF5 finds use in oxygen isotope...
presence of Lewis acids. The decolouration of bromine water by electron-rich arenes is used in the brominetest. The oxychlorination of benzene has been well...
A bromide ion is the negatively charged form (Br−) of the element bromine, a member of the halogens group on the periodic table. Most bromides are colorless...
In chemistry, the bromine number is the amount of bromine (Br2) in grams absorbed by 100 g of a sample. The bromine number was once used as a measure...
pool test kits. Chlorine can result in the bleaching of the dye in the absence of thiosulfate to inhibit the oxidizing chlorine. High levels of bromine can...
(MnO2). In this context, it is sometimes called Baeyer's reagent. However, bromine serves better in measuring unsaturation (double or triple bonds) quantitatively...
member of group 17 in the periodic table, below fluorine, chlorine, and bromine; it is the heaviest stable member of its group. (The fifth and sixth halogens...
2 Na2SO4 + H2O Similarly, sodium thiosulfate reacts with bromine, removing the free bromine from the solution. Solutions of sodium thiosulfate are commonly...
needed] Aqueous bromine may be distinguished from aqueous iodine by its appearance after extraction into heptane. In water, both bromine and iodine appear...
The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between...
which is 30-40 ppm), rubidium (110 ppm ± 47%), cesium (19.8 ppm ± 15%), bromine (91 ppm ± 31% vs 5000 ppm in the Dead Sea). The lake also comprises chloride...
bromide, which forms ethyl(3-hydroxyphenyl)dimethylammonium bromide, the bromine atom of which is replaced with a chlorine atom by reacting it with silver...
cycle is available to test and to qualify plastic parts as they reach the assembly line. IA-Mass identifies the presence of bromine (PBB, PBDE, and some...
value – Measure of an organic compound's nitrogen content Bromine number – Mass of bromine absorbed by 100 grams of a given substance Epoxy value – Measure...
formation of bromine radicals is stimulated by light. This would lead to undesirable side reactions, and thus falsifying a result consumption of bromine. For...
milliequivalents/kg, a rancid taste is noticeable. Acid value Amine value Bromine number Epoxy value Hydroxyl value Iodine value Saponification value Chemistry...
Bromatometry is a titration process in which the bromination of a chemical indicator is observed. Potassium bromate alone can be used for the analysis...
also give the test upon heating. Acetyl chloride and acetamide do not undergo this reaction. The halogen used may be chlorine, bromine, iodine or sodium...
perchlorate, and other analogous halogen oxyanions Fluorides of chlorine, bromine, and iodine Hexavalent chromium compounds such as chromic and dichromic...
metabolic processes into the active mutagen or carcinogen. Bromine and some compounds that contain bromine in their chemical structure. Sodium azide, an azide...
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