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Reactivity order of halides for dehydrohalogenation is:

1. R–F > R–Cl > R–Br > R–I
2. R–I > R–Br > R–Cl > R–F
3. R–I > R–Cl > R–Br > R–F
4. R–F > R–I > R–Br > R–Cl

Correct answer: R–I > R–Br > R–Cl > R–F

Solution

The reactivity order for dehydrohalogenation depends on the bond strength between carbon and the halogen. As the bond strength decreases from R–F to R–I, the reactivity increases, making R–I the most reactive.

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