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JEE Main202126 Aug 2021Evening ShiftChemistryCoordination CompoundsActual

Indicate the complex/complex ion which did not show any geometrical isomerism :

Options

  1. ACo NH 3 4 Cl 2 +
  2. BCo NH 3 3 NO 2 3
  3. CCo ( CN ) 5 ( NC ) 3 -
  4. DCoCl 2 ( en ) 2

Correct answer

C. Co ( CN ) 5 ( NC ) 3 -

Step-by-step solution

1 Co NH 3 4 Cl 2 + show cis-trans isomerism. 2 CoCl 2 ( en ) 2 show cis-trans isomerism. 3 Co NH 3 3 NO 2 3 show fac-mer isomerism. 4 [ Co ( CN ) 5 ( NC ) ] 3 - can't show geometrical isomerism due to the presence of plane of symmetry.

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