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JEE Advanced Chemistry Coordination Compounds 2021 JEE Advanced 2021 (Paper 2)

JEE Advanced Chemistry Question (2021) — Solution

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)

Options

  1. A. FeCl 4 -  and  Fe CO 4 2 -
  2. B. Co CO 4 -  and  CoCl 4 2 -
  3. C. Ni CO 4 and  Ni CN 4 2 -
  4. D. Cu Py 4 +  and  Cu CN 4 3 -

Answer

D. Cu Py 4 +  and  Cu CN 4 3 -

Step-by-step solution

FeCl 4 - :  sp 3  Tetrahedral Fe CO 4 2 -  :  sp 3  Tetrahedral (Isoelectronic to  Ni CO 4 ) Co CO 4 -  :  sp 3  Tetrahedral (Isoelectronic to  Ni CO 4 ) CoCl 4 2 -  :  sp 3  Tetrahedral Ni Co 4  :  sp 3  Tetrahedral (Complex of Mond's process) Ni CN 4 2 -  :  dsp 2  square planar (Cyanide is strong field ligand) Cu Py 4 +  :  sp 3  Tetrahedral Cu CN 4 3 -  :  sp 3  Tetrahedral

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