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Organic chemistry
Colour changes in reactions

Organic reagent Coloured reagent Colour change Reason

Alkene Potassium Purple to colourless The alkene turns
manganate into an alcohol (diol)
which is colourless.

Alkene Bromine water Yellow/brown to Br and OH group
colourless bromoalocohol.

Primary alcohol Potassium Orange to Dichromate
dichromate green/blue reduced to…

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