Propan-1-ol is heated with acidified potassium dichromate solution until the reaction is complete. What are the final organic product and the colour change?
Answer and explanation
Correct answer: B. Propanoic acid, with the solution changing from orange to green
- Step 1: Propan-1-ol is a primary alcohol, so it can be oxidised in two stages: first to propanal, then to propanoic acid.
- Step 2: Heating under reflux with excess oxidant gives the acid.
- Step 3: Orange dichromate(VI) is reduced to green chromium(III).
Answer
propanoic acid; orange to green.
Why not the others: Propanal is the intermediate; propanone comes from a secondary alcohol; purple relates to permanganate, not dichromate.
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