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Aldehyde: distil in situ, acidified potassium dichromate (VI), solution goes from orange to green, if this is further oxidised then you get carboxylic acid.
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Carboxylic acid: heat under reflux with excess acidified potassium dichromate (VI), colour change from: orange to green
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Ketone: acidified potassium dichromate (VI), colour change from: orange to green
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doesn't oxidise, colour change from: orange to orange
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In lab: heat under reflux, with concentrated sulfuric acid
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In industry: Aluminium oxide, 300oC at 1atm.
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Bromoalkane: HBr (aq) + NaBr (s) + conc. sulfuric acid
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Chloroalkane: conc. hydrochloric acid at room temp + pressure
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