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When t-butanol and n-butanol are separat...

When t-butanol and n-butanol are separately treated with a few drops of dilute `KMnO_4` in one case only, the purple colour disappears and a brown precipitate is formed. Which of the two alcohols gives the above reaction and what is the brown precipitate?

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and Brown ppt is due to the formation of` MnO_2`.
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