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UPSC Civil Services (Mains)

Chemistry optional

  • 2 papers
  • 250 marks each
  • 3 h per paper
  • 5 of 8 questions, Q1 and Q5 compulsory

Paper I covers physical and inorganic chemistry.

UPSC Civil Services (Mains), Chemistry optional · 2023 · Paper I

Q6(b). Stereoisomers of [Co(CN)₂(H₂O)₂(NH₃)₂]⁺

Question

Draw all possible stereoisomers of the [Co(CN)₂(H₂O)₂(NH₃)₂]⁺ complex ion.

Answer in brief

Six stereoisomers: five geometrical isomers, of which the all-cis form is chiral and exists as a pair of enantiomers.

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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 →

Coversstereoisomerismgeometrical isomersoptical isomersoctahedral complexesMa2b2c2Werner theory

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