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Rene
RafaBromine water can differentiate between alkanes and alkenes because alkenes can decolourize bromine water due to their ability to undergo addition reactions. Alkanes, being saturated hydrocarbons, do not react with bromine water because they lack double bonds to facilitate the addition reaction.
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Which test is better combustion or bromine water when testing alkenes against alkane?
The bromine water test is better for distinguishing between alkenes and alkanes. Alkenes decolorize bromine water due to their double bonds, forming a colorless solution, while alkanes do not react with bromine water. Combustion tests are not specific to alkenes and alkanes as both types of hydrocarbons will readily combust in the presence of oxygen.
What are the Chemical equations to distinguish between alkane and alkene?
One way to distinguish between an alkane and an alkene is to react them with bromine water. Alkanes do not react with bromine water, while alkenes undergo a decolorization reaction with bromine water. The chemical equations for these reactions are: Alkane: CnH2n+2 + Br2 -> No reaction Alkene: CnH2n + Br2 -> CnH2nBr2
Why does the bromine dissolved in carbon tetrachloride is not used to differentiate between alkenes and alyles?
Bromine dissolved in carbon tetrachloride is not typically used to differentiate between alkenes and alkynes because both alkenes and alkynes react with bromine under mild conditions, leading to addition reactions and forming dibromo compounds. This reaction does not provide a clear distinction between the two types of compounds. Other reagents, such as potassium permanganate or ozone, are more commonly used for distinguishing between alkenes and alkynes based on their respective chemical reactivity.
What decolorises bromine in the absence of sunlight?
Carbon tetrachloride can be used to decolorize bromine in the absence of sunlight. It acts as a reducing agent, converting the brown bromine to colorless hydrogen bromide.
Why does alkyne decolourise bromine water?
Alkynes can decolourize bromine water due to the addition reaction that occurs. The bromine molecules add across the carbon-carbon triple bond in the alkyne, forming a colorless dibromoalkane product. This reaction is specific to alkynes and does not occur with alkenes or alkanes.
