SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the observation obtained when alkene react with acidified KMnO4
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decolourize purple solution
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decolourize reddish brown solution
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decolourize blue solution
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yellow precipitate formed
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Explanation:
Detailed explanation-1: -Alkenes react with potassium manganate(VII) solution in the cold. The colorchange depends on whether the potassium manganate(VII) is used under acidic or alkaline conditions. If the potassium manganate(VII) solution is acidified with dilute sulfuric acid, the purple solution becomes colorless.
Detailed explanation-2: -When ethylene or ethene reacts with alkaline potassium permanganate it gives ethane-1, 2-diol or ethylene glycol. hydroxyl groups across the double bond thus it is known as hydroxylation reaction.
Detailed explanation-3: -Decolourisation of acidified KMnO4 occurs when H2O2 is added to it.
Detailed explanation-4: -turns acidified potassium permanganate from purple to colourless.
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