Assertion (A): Be forms \( \left[\mathrm{BeF}_{4}\right]^{2-} \) while Al forms \( \left[\mathrm...

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Assertion (A): Be forms \( \left[\mathrm{BeF}_{4}\right]^{2-} \) while Al forms \( \left[\mathrm{AlF}_{6}\right]^{3} \).
Reason (R): Be does not have vacant \( d \)-orbitals in the valence shell but \( \mathrm{Al} \) has.
(A) Both A and R are true and R is the correct explanation of A.br(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
(E) Both A and R are false.
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