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Indian Forest Service (Mains)

Chemistry optional

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

Paper I covers physical and inorganic chemistry.

Indian Forest Service (Mains), Chemistry optional · 2024 · Paper I

Q5(b). Isomers of a cobalt A₂B₂C₂ complex

Question

Draw the structures of possible diastereoisomers of [Co(NH₃)₂(H₂O)₂Cl₂]Cl. Among these isomer(s), which is/are optically active?

Answer in brief

There are five geometrical arrangements. Four are achiral; the all-cis arrangement occurs as an enantiomeric pair, giving six stereoisomers in total.

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Topic notes: Werner theory, isomerism, IUPAC names and valence bond theory of complexes, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversgeometrical isomerismoptical isomerismoctahedral Ma2b2c2 complexcobalt complex stereoisomerschirality

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