How is bromine used to test for unsaturation?

You can check for unsaturated fats using a simple test with bromine water. The test is similar to one used to differentiate alkenes from alkanes. Bromine water is a dilute solution of bromine, which is normally orange-brown in colour. It becomes colourless when shaken with an alkene, or with unsaturated fats.
A.

What is a bromine test for?

In organic chemistry, the bromine test is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds) and phenols. 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.
  • What is a bromine test for?

    In organic chemistry, the bromine test is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds) and phenols. 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.
  • Why does bromine water Decolourise with an alkene?

    Alkenes contain a C=C double bond and thus we call them "unsaturated hydrocarbons". Bromine (Br2) breaks this C=C double bond and attaches itself to the Alkene molecule, forming an Alkane. It's not just Cyclohexene, but ALL Alkene molecules that decolourise when they react with Bromine water.
  • What is baeyer's test used for?

    Baeyer's reagent is an alkaline solution of cold potassium permanganate, which is a powerful oxidant making this a redox reaction. Reaction with double or triple bonds (-C=C- or -C≡C-) in an organic material causes the color to fade from purplish-pink to brown. It is a syn addition reaction.
B.

What is the bromine test used for?

In organic chemistry, the bromine test is a qualitative test for the presence of unsaturation (carbon-to-carbon double or triple bonds) and phenols. An unknown sample is treated with a small amount of elemental bromine in an organic solvent, being as dichloromethane or carbon tetrachloride.
  • What is the general formula of the alkanes?

    Alkanes: Molecular and Structural Formulas. The alkanes comprise a series of compounds that are composed of carbon and hydrogen atoms with single covalent bonds. This group of compounds comprises a homologous series with a general molecular formula of C n H 2 n+2 , where equals any integer.
  • What product is formed when propene reacts with bromine?

    The double bond breaks, and a bromine atom becomes attached to each carbon. The bromine loses its original red-brown colour to give a colourless liquid. In the case of the reaction with propene, 1,2-dibromopropane is formed. The other halogens, apart from fluorine, behave similarly.
  • What is the chemical formula for bromine water?

    Actually it's not a chemical compound, it is an aquous solution of Br2. So it is generally represented as Br2(aq). Bromine water is a highly oxidizing intense yellow to red mixture containing diatomic bromine (Br2) dissolved in water (H2O).
C.

What is the bromine water test?

Testing for alkenes. Bromine water is a dilute solution of bromine that is normally orange-brown in colour, but becomes colourless when shaken with an alkene. Alkenes can decolourise bromine water, while alkanes cannot.
  • Why is the cracking process important?

    The actual reaction is known as homolytic fission and produces alkenes, which are the basis for the economically important production of polymers. Thermal cracking is currently used to "upgrade" very heavy fractions or to produce light fractions or distillates, burner fuel and/or petroleum coke.
  • Are alkenes unsaturated?

    Alkenes are unsaturated hydrocarbons. They contain a double covalent bond, which is shown as two lines between two of the carbon atoms. The presence of this double bond allows alkenes to react in ways that alkanes cannot.
  • Why does benzene not react with bromine water?

    unsaturated compounds decolourise bromine. Benzene has no double bonds, however benzene has a ring of delocalised electrons for that reason benzene is less reactive.

Updated: 10th October 2018

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