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Why does acidified potassium permanganate turn from purple to colorless when added to an alkene?
Wiki User
∙ 8y ago
The purple colour is the Manganese in oxidation state '+7'.
This oxidation state is reduced to '+2' ,which is pale green/colourless, when reacted with the alkene.
Hence the change of colour.
lenpollock
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If you are doing the baeyer test and your solution stays purple what does that mean?
it means it is neither an alkene or an alkyne since potassium permanganate fades to pink or brown when it reacts to those hydrocarbons.
Is turpentine an alkane or alkene?
It is an alkene
What is the equation between hexane and potassium permanganate?
Potassium permanganate and hexane do not react because hexane is an alkane and therefore has no double bonds. Hexene on the other hand is an alkene and can indeed react with potassium permanganate.
Is C5H10 alkane or alkene?
The general formula for alkenes is 'CnH2n'. Sp for C5H10 Substituting for 'n' it becomes C5H(2(5)) = C5H10 . Hence itv is an Alkene.
What is the empirical formula of an alkene?
The general formula for a noncyclic alkene is CnH2n, where "n" represents an integer; for a mono cyclic alkene, the general formula is CnH2n-2.
What is the test for unsaturation?
Add KMnO4 (Potassium Permanganate) which is a purple solution. If it is added to an alkene or alkyne it will turn colourless and produces a brown precipitate.
If you are doing the baeyer test and your solution stays purple what does that mean?
it means it is neither an alkene or an alkyne since potassium permanganate fades to pink or brown when it reacts to those hydrocarbons.
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.
What contains two convalent bonds?
Oxyanions such as sulfate, phosphate and permanganate, any alkene, oxygen molecule are some of the examples for compounds which have double bonds in them.
Is turpentine an alkane or alkene?
It is an alkene
What is the equation between hexane and potassium permanganate?
Potassium permanganate and hexane do not react because hexane is an alkane and therefore has no double bonds. Hexene on the other hand is an alkene and can indeed react with potassium permanganate.
Is 1-nonene an alkane alkene or an alcohol?
alkene
Is 1 nonene alkane alkene or alcohol?
Alkene
Is cyclopentene an alkane alkene or alcohol?
Its a cycloalkene
What type of molecule is 2-methylpentene?
branched alkene...viva la apex
Is a 2-butene an alkane or an alkene or an alcohol?
2-butene is an alkene
What is the Alkene boiling point?
Which alkene? Ethylene, propylene, eicosene???
