In which of the following arrangements the order is NOT according to the property indicated against it?

• A

  $$ \mathrm{Al}^{3+} < \mathrm{Mg}^{2+} < \mathrm{Na}^{+} < \mathrm{F}^{-} $$ Increasing ionic size
• Correct answer
  B

  $$ \mathrm{B} < \mathrm{C} < \mathrm{N} < \mathrm{O} $$ Increasing first ionization enthalpy
• C

  $$ \mathrm{l} < \mathrm{Br} < \mathrm{F} < \mathrm{Cl} $$ Increasing electron gain enthalpy (with negative sign)
• D

  $\mathrm{Li} < \mathrm{Na} < \mathrm{K} < \mathrm{Rb}$ Increasing metallic radius

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