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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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For elements B, C, N Li, Be, O and F, the correct order of first ionization enthalpy is
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Correct option: D
Li<B<Be<C<O<N<F\mathrm{Li} < \mathrm{B} < \mathrm{Be} < \mathrm{C} < \mathrm{O} < \mathrm{N} < \mathrm{F}
Option D (Li<B<Be<C<O<N<F\mathrm{Li} < \mathrm{B} < \mathrm{Be} < \mathrm{C} < \mathrm{O} < \mathrm{N} < \mathrm{F}) is correct because it accounts for the exceptions due to stable electronic configurations in Be and N.

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