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Oxidation of alcohols. Acidified potassium permanganate (H + /KMnO 4 ), and acidified potassium dichromate (H + /K 2 Cr 2 O 7 ) are important oxidising.

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Presentation on theme: "Oxidation of alcohols. Acidified potassium permanganate (H + /KMnO 4 ), and acidified potassium dichromate (H + /K 2 Cr 2 O 7 ) are important oxidising."— Presentation transcript:

1 Oxidation of alcohols

2 Acidified potassium permanganate (H + /KMnO 4 ), and acidified potassium dichromate (H + /K 2 Cr 2 O 7 ) are important oxidising agents. They will not react unless acid is present. Purple H + /MnO 4 - turns colourless when it has reacted. Orange H + /Cr 2 O 7 2- turns blue/green when it has reacted.

3 Primary alcohol with acidified dichromate; secondary alcohol with acidified permanganate, tertiary alcohol with acidified dichromate. The reactions are very slow unless heated in a water bath.

4 The primary alcohol has turned the dichromate blue/green. The secondary alcohol has decolourised the permanganate. The tertiary alcohol has not reacted with the dichromate.

5 Primary alcohols are oxidised by acidified dichromate or acidified permanganate. They form an aldehyde, and then a carboxylic acid. Secondary alcohols are also oxidised by these oxidising agents. They form ketones. Tertiary alcohols do not react with oxidising agents such as permanganate and dichromate.


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