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What is the oxidation pathways of primary alcohols?
Primary alcohol —> aldehyde —> carboxylic acid
Which reagents oxidise primary alcohols?
Acidified potassium dichromate (K₂Cr₂O₇ / H⁺)
Acidified potassium manganate(VII) (KMnO₄ / H⁺)
What are the colour changes
Dichromate: orange → green
Manganate(VII): purple → colourless
How do you oxidise a primary alcohol to an aldehyde?
Heat gently
Distil immediately
Prevents further oxidation
How do you oxidise a primary alcohol to a carboxylic acid?
Heat under reflux
Use excess oxidising agent
Allows full oxidation