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Coordination Compounds — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
MCQ
Which of the following does not show optical isomerism?
  • ✓
    $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$
  • B
    $\left[\mathrm{Co}(\mathrm{en}) \mathrm{Cl}_2\left(\mathrm{NH}_3\right)_2\right]^{+}$
  • C
    $\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}$
  • D
    $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$
✓

Answer

Correct option: A.
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$
The compound $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$ does not show optical isomerism.
This is a coordination compound where coordination number is 6 and geometry octahedral symmetrical. Compounds with an octahedral geometry having bidentate ligands show optical isomerism.
The given compound does not contain any bidentate ligands, also it has symmetrical geometry, thus, it does not show optical isomerism.

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