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12 grade chemistry others

Which of the following is not optically active?

  • A. [Co(en)₃]³⁺
  • B. [Cr(ox)₃]³⁻
  • C. cis - [CoCl₂(en)₂]⁺
  • D. trans - [CoCl₂(en)₂]⁺

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11 Months agoGrade
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1 Answer

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ApprovedApproved Tutor Answer11 Months ago

To determine which of the given complexes is not optically active, we need to consider their symmetry and structure.

Understanding Optical Activity

Optical activity refers to the ability of a compound to rotate plane-polarized light. This property is typically found in chiral molecules, which lack an internal plane of symmetry.

Analyzing the Options

  • A. [Co(en)₃]³⁺: This complex is chiral due to the arrangement of the ethylenediamine (en) ligands, making it optically active.
  • B. [Cr(ox)₃]³⁻: The oxalate (ox) ligands create a symmetrical structure, leading to no optical activity.
  • C. cis - [CoCl₂(en)₂]⁺: The cis arrangement of ligands results in chirality, thus it is optically active.
  • D. trans - [CoCl₂(en)₂]⁺: The trans configuration has a plane of symmetry, making it not optically active.

Final Thoughts

Among the options, both B and D are not optically active. However, if you need to choose one, B. [Cr(ox)₃]³⁻ is the best answer as it is inherently symmetrical and does not exhibit optical activity.

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