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AIIMS 2004
Exam
AIIMS
Year
2004
Subject
Chemistry
Chapter
Coordination Compounds

AIIMS 2004 · Chemistry · Coordination Compounds

Which of the following does not have optical isomer?

Which of the following does not have optical isomer?

Options

  1. A[Co(NH3)3Cl3]\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]
  2. B[Co(en)3]Cl3\left[\mathrm{Co}(\mathrm{en})_3\right] \mathrm{Cl}_3
  3. C[Co(en)2Cl2]Cl\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right] \mathrm{Cl}
  4. D[Co(en)(NH3)2Cl2]Cl\left[\mathrm{Co}(\mathrm{en})\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right] \mathrm{Cl}

Correct answer

A. [Co(NH3)3Cl3]\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]

Step-by-step solution

Optical isomerism is very common in octahedral complexes of general formulae, [Ma2b2c2]n±,[Mabcdef],[M(AA)3]n±\left[M a_2 b_2 c_2\right]^{n \pm},[M a b c d e f],\left[M(A A)_3\right]^{n \pm},\left[M(A A)_2 a_2\right]^{n \pm}, [M(AA)a2b2]n±\left[M(A A) a_2 b_2\right]^{n \pm},[M(AA)2ab]n±,\left[M(A A)_2 a b\right]^{n \pm} and \left[M(A B)_3\right]^{n \pm},whereAA, where A A is symmetrical bidentate ligand and A Bisunsymmetricalbidentateligand.Octahedralcomplexofthetypeis unsymmetrical bidentate ligand. Octahedral complex of the typeM a_4 b_2 and M a_3 b_3 exhibit geometrical isomerism.
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