Which reaction is not feasible?

  • A
    $2KI + Br_2 \to 2KBr + I_2$
  • B
    $2KBr + I_2 \to 2KI + Br_2$
  • C
    $2KBr + Cl_2 \to 2KCl + Br_2$
  • D
    $2H_2O + 2F_2 \to 4HF + O_2$

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