AIIMS 2018 Chemistry Coordination Number MCQ Question
Assertion : Both and can form complexes such as and respectively. is not formed.
Reason : In case of , no vacant d-orbitals are present in its outermost shell.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Beryllium (Be) has no vacant d-orbitals in its outermost shell, limiting its ability to expand its coordination number beyond four. Consequently, Be can form complexes like BeF₄²⁻, where it utilizes its available orbitals effectively, while aluminum (Al), with its vacant d-orbitals, can form AlF₆³⁻. However, BeF₆³⁻ is not feasible due to the lack of available orbitals for bonding, making option A correct. The other options are not relevant as they do not provide alternative explanations or correct structures.
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