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In the activity oxidising ethanol with potassium permanganate, the purple colour persisting when excess reagent is added indicates that

Question
In the activity oxidising ethanol with potassium permanganate, the purple colour persisting when excess reagent is added indicates that
All the ethanol has already reacted, so no more oxidising agent is being consumed
The reaction has not started yet
Ethanol is itself an oxidising agent
Potassium permanganate is not an oxidising agent
Answer
All the ethanol has already reacted, so no more oxidising agent is being consumed
Detailed Explanation
Once all the ethanol has reacted, additional potassium permanganate has nothing left to oxidise, so its colour persists.
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