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Which reaction is not feasible?

1. 2KI + Br2 → 2KBr + I2
2. 2KBr + I2 → 2KI + Br2
3. 2KBr + Cl2 → 2KCl + Br2
4. 2H2O + 2F2 → 4HF + O2

Correct answer: 2KBr + I2 → 2KI + Br2

Solution

Iodine (I2) cannot displace bromine (Br2) from potassium bromide (KBr) because iodine is less reactive than bromine in the halogen reactivity series.

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