AIIMS 2018 Chemistry Complex Formation Assertion Reason Question

Option A is correct because both the assertion and reason are true: Be and Al can indeed form complexes like BeF₄²⁻ and AlF₆³⁻, respectively, and the reason accurately explains that Be does not have vacant d-orbitals in its outermost shell, which limits its ability to form higher coordination complexes like BeF₆³⁻. Option B is incorrect because the reason does explain the assertion. Option C is incorrect as both statements are true, and option D is false since both the assertion and reason are valid. Understanding the role of d-orbitals in complex formation is crucial in coordination chemistry, particularly for elements in groups 2 and 13 of the periodic table.