JEE Advanced 2021 Chemistry question

The pair(s) of complexes wherein 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)

(A) and Correct
(B) and Correct
(C) and
(D) and Correct

Answer: (A),(B),(D)

Solution

(A) : () with weak-field , – tetrahedral; : Fe(II), , – tetrahedral. Both tetrahedral. (B) : Co(I), – tetrahedral; : () with

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Question ID VK-033920