What is the product of the reaction between an alkene and cold dilute acidified KMnO4 solution?
A diol
A diol is a compound with two alcohol (O-H) groups.
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What colour change is observed when an alkene is oxidised by cold dilute acidified KMnO4 solution?
(Pale) purple to colourless
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Explain how reaction temperature and KMnO4 concentration determine the major product formed in the oxidation of alkenes.
Cold dilute KMnO4 produces a diol.
Hot concentrated KMnO4 breaks the C=C bond completely, giving ketones, aldehydes, carboxylic acids or CO2 depending on groups bonded to C=C.
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How can hot concentrated acidified KMnO4 oxidation of an alkene help determine the position of its carbon-carbon double bond?
The products formed indicate what groups were originally bonded to the C=C carbons.
For example, if CO2 forms, the double bond must have been between the end carbons.
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What is formed when a carbon atom bonded to two hydrogens is oxidised by hot concentrated KMnO4?
Carbon dioxide
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What is formed when a carbon atom bonded to one hydrogen and one alkyl group is oxidised by hot concentrated KMnO4?
A carboxylic acid
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What is formed when a carbon atom bonded to two alkyl groups is oxidised by hot concentrated KMnO4?
A ketone
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