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JEE Advanced2021ChemistryCoordination CompoundsActual

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. AFeCl 4 - and Fe CO 4 2 -
  2. BCo CO 4 - and CoCl 4 2 -
  3. CNi CO 4 and Ni CN 4 2 -
  4. DCu Py 4 + and Cu CN 4 3 -

Correct answer

A. FeCl 4 - and Fe CO 4 2 -

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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