Give a brief description of bromine - water test. (5 marks)
Bromine water test: In organic chemistry, the bromine test is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds) and phenols. Bromine water is a dilute solution of bromine that is normally orange-brown in colour, but becomes colourless when shaken with alkene and phenol
Testing Phenol: 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 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 in form of a white precipitate indicates that the unknown was a phenol
Testing Alkenes: When bromine water solution is added to alkene and shaken it becomes. Alkenes can decolourise bromine water, while alkanes cannot.
Bromine water test: In organic chemistry, the bromine test is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds) and phenols. Bromine water is a dilute solution of bromine that is normally orange-brown in colour, but becomes colourless when shaken with alkene and phenol
Testing Phenol: 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 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 in form of a white precipitate indicates that the unknown was a phenol
Testing Alkenes: When bromine water solution is added to alkene and shaken it becomes. Alkenes can decolourise bromine water, while alkanes cannot.
