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What simple chemical test will distinguish an alkane from others?
Use bromine water (Br2) or acidified permanganate (H+/MnO4-) With permanganate: add the permanganate to the alkane and no reaction will occur, add the permanganate to the alkene and you will form a diol the solution will also turn from purple to colourless. With bromine water: add the bromine water to the alkane (plus you need sunlight) and you get a substitution reaction, this is a slow reaction. Add the bromine water to the alkene and you get an immediate addition reaction (this one does not need sunlight). When bromine water reacts with an alkene it is decolourised, the reddish brown bromine water turns from brown to colourless. This is because alkenes are unsaturated and contain a carbon to carbon double bond. If you did the bromine water test in a dark place say a cupboard then the alkene would decolourise but the alkane wouldn't because it needs UV/sunlight in order to react. in practice the cupboard is not necessary as the speed of decolourisation is so much faster with the alkene.
How do you identify this type of reaction?
During the elimination reactions of saturated organic compounds double bond (Alkene) or triple bond (Alkyne) is formed to check them add Bromine solution to reaction mixture the decolourization of bromine confirms the elimination reaction
How bromine water can be used to test for an alkene?
Alkenes, or hydrocarbons with at least one double bond undergo an addition reaction when combined with bromine (Br2). The general reaction is H2C=CH2 --> H2BrC--CBrH2, and it occurs readily. This reaction is a good way to identify alkenes because bromine has a reddish color, while alkanes and alkenes are colorless. So if bromine is added to an unknown hydrocarbon, the disappearance of the color is an indication of the presence of a pi bond.
What is an alkenyl?
An alkenylation is any reaction with an alkene, especially an addition reaction.
Is an alkene to an alkane a oxidation reaction?
no
What simple chemical test will distinguish an alkane from others?
Use bromine water (Br2) or acidified permanganate (H+/MnO4-) With permanganate: add the permanganate to the alkane and no reaction will occur, add the permanganate to the alkene and you will form a diol the solution will also turn from purple to colourless. With bromine water: add the bromine water to the alkane (plus you need sunlight) and you get a substitution reaction, this is a slow reaction. Add the bromine water to the alkene and you get an immediate addition reaction (this one does not need sunlight). When bromine water reacts with an alkene it is decolourised, the reddish brown bromine water turns from brown to colourless. This is because alkenes are unsaturated and contain a carbon to carbon double bond. If you did the bromine water test in a dark place say a cupboard then the alkene would decolourise but the alkane wouldn't because it needs UV/sunlight in order to react. in practice the cupboard is not necessary as the speed of decolourisation is so much faster with the alkene.
How do you identify this type of reaction?
During the elimination reactions of saturated organic compounds double bond (Alkene) or triple bond (Alkyne) is formed to check them add Bromine solution to reaction mixture the decolourization of bromine confirms the elimination reaction
What is the reagent to distinguish alkene and alkyne?
Bromine
An alkene can be combined with chlorine and bromine in a?
Alkene + Cl2 or Br2 --> Adducts (addition products) dichloor alkane, dibroom alkane
How bromine water can be used to test for an alkene?
Alkenes, or hydrocarbons with at least one double bond undergo an addition reaction when combined with bromine (Br2). The general reaction is H2C=CH2 --> H2BrC--CBrH2, and it occurs readily. This reaction is a good way to identify alkenes because bromine has a reddish color, while alkanes and alkenes are colorless. So if bromine is added to an unknown hydrocarbon, the disappearance of the color is an indication of the presence of a pi bond.
What is the Use of everyday life in bromine?
it can be used to see if the hydrocarbon you have just cracked is an alkane or an alkene (it with turn orange to colourless if it is an alkene)
What is an alkenyl?
An alkenylation is any reaction with an alkene, especially an addition reaction.
Why the unsaturated compound decolourises with bromine?
bromine water is oxidising in nature. it removes the double bonds and attaches itself to the alkene.
Is an alkene to an alkane a oxidation reaction?
no
What changes in color occur when bromine or KMnO4 reacts with an alkene?
The purple KMnO4 is decolourise
Which type of reaction will an alkene not undergo?
dehydration
What test distinguishes between alkene and alcohol?
Baeyer's test for unsaturation using KMnO4 . if the sol'n retains the purple color of the reagent , then it is an alkane. if the color disappears with formation of brown precipitate ,it indicates presence of unsaturated HC
