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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2017 · Mains Paper I

Q4(b). Jahn–Teller activity

Question

Identify the presence or absence of Jahn-Teller distortion in [Fe(CN)₆]⁴⁻ and [Cu(H₂O)₆]²⁺. Justify your answer.

Answer in brief

Low-spin [Fe(CN)₆]⁴⁻ has no first-order Jahn–Teller distortion; [Cu(H₂O)₆]²⁺ is strongly Jahn–Teller active.

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CoversJahn–Teller activityLigand-field theory

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