Chemistry · PYQ NEET UG 2016(1)

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

1. A
   \( \mathrm{I} < \mathrm{Br} < \mathrm{Cl} < \mathrm{F} \) (increasing electron gain enthalpy)
2. B
   \( \mathrm{B} < \mathrm{C} < \mathrm{N} < \mathrm{O} \) (increasing first ionisation enthalpy)
3. C
   \( \mathrm{Li} < \mathrm{Na} < \mathrm{K} < \mathrm{Rb} \) (increasing metallic radius)
4. D
   \( \mathrm{Al}^{3+} > \mathrm{Mg}^{2+} < \mathrm{Na}^+ < \mathrm{F}^- \) (increasing ionic size)