0
This is because alkenes are unsaturated. They have a C=C double bond. Electrons just waiting to be taken.
Bromine is a halogen. It's dying to get just one more electron to fill its octet, so Br2 will attack the C=C and take some electrons in the form of a covalent bond.
Example:
H2C=CH2 + Br2 ---> H2BrC-CBrH2
Now each carbon has 4 bonds and Bromine has filled its octet. All's good.
Yes, alkenes will decolourize bromine water because alkenes can undergo addition reactions with bromine. The double bond in the alkene reacts with the bromine, breaking it apart and causing the characteristic brown color of bromine water to fade.
Alkanes don't, ALKENEs do by chemically bonding with the Bromine across its double bond.
Alkanes only turn Bromine water colourless in the presence of sunlight. This is due to a photo-chemical reaction in which free radicals are formed. This reaction may also be called a substitution reaction.
It's because, bromine water, being a good oxidising agent oxidises SO2 to H2SO4.
Add your answer:
Earn +20 pts
A chemical equation for alkene reaction with bromine water in tetra chloride?
Alkene + Bromine water in tetrachloromethane (CCl4): CnH2n + Br2 -> CnH2nBr2
What test distinguishes between alkene and alcohol?
The Bromine test can distinguish between alkenes and alcohols. When bromine water is added to an alkene, it will decolorize due to the addition reaction with the alkene double bond. In contrast, alcohols do not react with bromine water and the color remains unchanged. This test can be used to differentiate between the two functional groups.
What is the reagent to distinguish alkene and alkyne?
Bromine in water or bromine water can be used to distinguish between an alkene and an alkyne. Alkenes will decolorize bromine water by undergoing addition reactions, while alkynes will not react under normal conditions and will not decolorize bromine water.
What is the observation between bromine and propene?
When bromine reacts with propene, the double bond in propene breaks and bromine atoms add across the double bond, forming a dibromoalkane product. This reaction is a classic example of an addition reaction between an alkene and a halogen.
When benzene reacts with bromine water will it decolourise bromine water or not?
Yes, benzene does not react with bromine water, so the bromine water will retain its reddish-brown color when benzene is added to it.
What changes in color occur when bromine or KMnO4 reacts with an alkene?
The purple KMnO4 is decolourise
A chemical equation for alkene reaction with bromine water in tetra chloride?
Alkene + Bromine water in tetrachloromethane (CCl4): CnH2n + Br2 -> CnH2nBr2
What test distinguishes between alkene and alcohol?
The Bromine test can distinguish between alkenes and alcohols. When bromine water is added to an alkene, it will decolorize due to the addition reaction with the alkene double bond. In contrast, alcohols do not react with bromine water and the color remains unchanged. This test can be used to differentiate between the two functional groups.
What is the reagent to distinguish alkene and alkyne?
Bromine in water or bromine water can be used to distinguish between an alkene and an alkyne. Alkenes will decolorize bromine water by undergoing addition reactions, while alkynes will not react under normal conditions and will not decolorize bromine water.
What simple chemical test will distinguish an alkane from others?
The Bromine Test can be used to distinguish alkanes from other organic compounds. Alkanes will not react with bromine, while unsaturated compounds like alkenes and alkynes will decolorize a solution of bromine water.
What is the observation between bromine and propene?
When bromine reacts with propene, the double bond in propene breaks and bromine atoms add across the double bond, forming a dibromoalkane product. This reaction is a classic example of an addition reaction between an alkene and a halogen.
What is the different between saturated and unsaturated?
Saturated hydrocarbon does not decolourise bromine water while unsaturated hydrocarbon decolourize it.
When benzene reacts with bromine water will it decolourise bromine water or not?
Yes, benzene does not react with bromine water, so the bromine water will retain its reddish-brown color when benzene is added to it.
How bromine water can be used to test for an alkene?
Bromine water can be used to test for an alkene by adding it to the alkene. The alkene will decolorize the orange-brown bromine water, turning it colorless, due to the addition of bromine across the carbon-carbon double bond in the alkene molecule. This reaction tests for the presence of unsaturation in the compound.
Which one of the following tests will best allow you to distinguish between an aldehyde and an alkene?
bromine water
What is a positive test for an alkene?
A positive test for an alkene is the addition of bromine water, which will turn from orange/red to colorless when it reacts with the alkene due to halogenation of the double bond. This test is used to confirm the presence of alkenes.
What happens when bromine water reacts with alkenes?
Bromine water reacts with alkenes through an electrophilic addition reaction where the pi bond of the alkene breaks, and bromine atoms are added to the carbon atoms. This reaction results in the decolorization of the bromine water, changing it from orange to colorless.
