";s:4:"text";s:2568:" This is because the bromine breaks the double hydrogen bond in hexene (an alkene) to form an alkane.. The other halogens, apart from fluorine, behave similarly. This decoloration of bromine is often used as a test for a carbon-carbon double bond. The difference between Hexane and Hexene: To distinguish between hexane and hexene we can perform the Bromine Water Test.Bromine water, brown in colour is decolourised by hexene but not by hexane.
The reasons for this are beyond UK A level chemistry.
If you use bromine instead of chlorine, the great majority of the product is where the bromine is attached to the centre carbon atom. Cycloalkanes. This is because the bromine breaks the double hydrogen bond in hexene (an alkene) to form an alkane.. The reactions of the cycloalkanes are generally just the same as the alkanes, with the exception of the very small ones - particularly cyclopropane. If an aqueous solution of bromine is used ("bromine water"), you get a mixture of products. The reaction occurs through a free-radical mechanism. With an excess of hexane or short reaction times, the primary products will be 2-bromohexane and 3-bromohexane. It is considered that CHBr 3 generated through radical abstraction of a hydrogen atom by a tribromomethyl radical served as a bromine source. They are flammable liquids and have irritating vapours. However, when the compound is already an alkane (in this case hexane) the bromine stays in … The reaction between hexene, bromine, and water is an addition reaction resulting in the formation of a bromohydrin.
Hexane and hexene are hydrocarbons. The presence of the C=C double bond allows alkenes to react in ways that alkanes cannot. (Fluorine reacts explosively with all hydrocarbons - including alkenes - to give carbon and hydrogen fluoride.) This allows us to tell alkenes apart from alkanes using a simple chemical test.