A) \[A{{l}^{3+}}<M{{g}^{2+}}<N{{a}^{+}}<{{F}^{-}}\] : Increasing ionic size
B) \[B<C<N<O\] : Increasing first ionization enthalpy
C) \[I<Br<F<Cl\] : Increasing electron gain enthalpy (with negative sign)
D) \[Li<Na<K<Rb\] : Increasing metallic radius
Correct Answer: B
Solution :
\[B<C<N<O\]; When we move from B to O in a periodic table the first ionisation enthalpy increase due to the attraction of nucleous towords the outer most of electron.
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