Which of the following halides is not oxidised by MnO2?
(1) F  (2) CI   (3) Br   (4) I

Answer: Option 1
MnO2 is a strong oxidizing agent, commonly used in chemical reactions to oxidize other substances. But, it does not oxidize fluorine (F-) because fluorine is a stronger oxidizing agent than MnO2. That means, fluorine is already in its highest oxidation state (-1), and it cannot be oxidized by MnO2 further. Also, MnO2 can oxidize chlorine (Cl-), bromine (Br-), and iodine (I-) to higher oxidation states compounds, such as Cl2, Br2, and I2, respectively.

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