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Which reagent is used to convert allyl alcohol into acrolein?

1. MnO2
2. H2O2
3. OsO4
4. KMnO4

Correct answer: MnO2

Solution

Activated MnO2 selectively oxidises allylic (and benzylic) alcohols to the corresponding aldehydes without touching the C=C. Thus CH2=CH-CH2OH (allyl alcohol) -> CH2=CH-CHO (acrolein).

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