Which of the following reactions is an example of a redox reaction?

• A

  ${\mathrm{XeF}}_2+{\mathrm{PF}}_5\to {\left[\mathrm{XeF}\right]}^{+}{\mathrm{PF}}_6^{-}$
• B

  ${\mathrm{XeF}}_6+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{XeOF}}_4+2\mathrm{HF}$
• C

  ${\mathrm{XeF}}_6+2{\mathrm{H}}_2\mathrm{O}\to {\mathrm{XeO}}_2{\mathrm{F}}_2+4\mathrm{HF}$
• Correct answer
  D

  ${\mathrm{XeF}}_4+{\mathrm{O}}_2{\mathrm{F}}_2\to {\mathrm{XeF}}_6+{\mathrm{O}}_2$

Hence, the correct answer is option: 'D'.