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ALKENES and POTASSIUM MANGANATE(VII): Test for a double bond (not benzene)

ALKENES and POTASSIUM MANGANATE(VII): Test for a double bond (not benzene). Alkenes react with potassium manganate(VII) solution in the cold. The colour change depends on whether the potassium manganate(VII) is used under acidic or alkaline conditions.

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ALKENES and POTASSIUM MANGANATE(VII): Test for a double bond (not benzene)

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  1. ALKENES and POTASSIUM MANGANATE(VII):Test for a double bond (not benzene) Alkenes react with potassium manganate(VII) solution in the cold. The colour change depends on whether the potassium manganate(VII) is used under acidic or alkaline conditions. If the potassium manganate(VII) solution is acidified with dilute sulphuric acid, the purple solution becomes colourless. If the potassium manganate(VII) solution is made slightly alkaline (often by adding sodium carbonate solution), the purple solution first becomes dark green and then produces a dark brown precipitate.

  2. Or to include molar quantities: • Under acidic conditions • Under alkaline conditions: Note that the product ethane-1,2-diol is quite easily oxidized by KMnO4 especially under acidic conditions where the C-C bond can break

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