In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

• A

  $\mathrm{A}{\mathrm{l}}^{3+}<\mathrm{M}{\mathrm{g}}^{2+}<\mathrm{N}{\mathrm{a}}^{+}<{\mathrm{F}}^{-}$ (increasing ionic size)
• Correct answer
  B

  $\mathrm{B}<\mathrm{C}<\mathrm{N}<\mathrm{O}$ (increasing first ionization enthalpy)
• C

  $\mathrm{I\; < }\mathrm{B}\mathrm{r\; <\; F}\mathrm{ < }\mathrm{Cl}$ (increasing electron gain enthalpy)
• D

  $\mathrm{L}\mathrm{i}<\mathrm{N}\mathrm{a}<\mathrm{K}<\mathrm{R}\mathrm{b}$ (increasing metallic radius)

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