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Which is the most suitable reagent for the following transformation ? CH 3 –CH = CH – CH 2 – CH – CH 3 → OH CH 3 – CH = CH – CH 2 CO 2 H

1. alkaline KMnO 4
2. Tollen's neagent
3. I 2 /NaOH
4. CrO 2 Cl 2 /CS 2

Correct answer: I 2 /NaOH

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