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A student monitors a reaction using TLC. The starting material has a spot with an Rf of 0.25. After 10-min, the reaction has a spot

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A student monitors a reaction using TLC. The starting material has a spot with an Rf of 0.25. After 10-min, the reaction has a spot with an Rf of 0.25. After 15-min, the reaction has a spot with an Rf of 0.25. After 20-min, the reaction has a spot with an Rf of 0.15. After 25-min, the reaction has a spot with an Rf of 0.15. At what time was the reaction done? O 15-min 20-min 25-min O 10-min

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