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But$-2-$ene on reaction with alkaline $KMnO_4$ at elevated temperature followed by acidification will give:
- AOne molecule of $CH_3CHO$ and one molecule of $CH_3COOH$
- B$2$ molecules of $CH_3CHO$
- C$2$ molecules of $CH_3COOH$
- D$CH_3-CH(OH)-CH(OH)-CH_3$
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