The pair(s) of complexes where in both exhibit tetrahedral geometry is(are) (Note: py = pyridine Given: Atomic numbers of Fe, Co, Ni and Cu are 26, 27, 28 and 29, respectively)

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FeCl4−and Fe(CO)42−

Co(CO)4−and CoCl42−

Ni(CO)4 and Ni(CN)42−

Cu(py)4+and Cu(CN)43−

answer is A.

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Detailed Solution

(1) FeCl4−Fe2+=3d64s0

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