Home Chemistry Co-ordinatios Compounds NEET Previous Year Question Which of the following does not show optical…
Chemistry Co-ordinatios Compounds NEET Previous Year Question Single Correct MCQ
Published on: August 13, 2026

Which of the following does not show optical isomerism? (en = ethylenediamine)

A
[Co(en) 2 Cl 2 ] +
B
[Co(NH 3 ) 3 Cl 3 ] 0
C
[Co(en)Cl 2 (NH 3 ) 2 ] +
D
[Co(en) 3 ] 3+

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Text Solution

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The correct answer is:
B

Optical isomerism is exhibited by only those complexes in which elements of symmetry are absent. Octahedral complexes of the types [M(aa) 3 , [M(aa)x 2 ,y 2 ] and [M(aa) 2 x 2 ] have absence of elements of symmetry, thus exhibit optical isomerism. Here, aa represents bidentate ligand, x or y represents monodentate ligand and M represent central metal ion. Hence, [Co (NH 3 ) 3 Cl 3 ] 0 due to presence of symmeytry elements does not exhibit optical isomerism.

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