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But-2-ene on reaction with alkaline KMnO 4 at elevated temperature followed by acidification will give:

1. one molecule of CH 3 CHO and one molecule of CH 3 COOH
2. 2 molecules of CH 3 COOH
3. CH 3 –CH––CH–CH 3 | OH | OH
4. 2 molecules of CH 3 CHO

Correct answer: 2 molecules of CH 3 COOH

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