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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper II, Chemistry · Q96 of 120

Geo-Scientist Prelims 2020 Chemistry Q96: The total number of stereoisomers possible for the given compound is:

QuestionStereochemistry / counting isomers

The total number of stereoisomers possible for the given compound is:

UPSC Combined Geo-Scientist Prelims 2020 Paper II (Chemistry), Q96: figure printed with the question
  1. (a) 4
  2. (b) 6
  3. (c) 8
  4. (d) 10

Answer: (a) 4

ClCH₂CH=CH–CH=CHCH₂CH₃ has two stereogenic C=C with different ends (no stereocentre). Unsymmetrical, so 2² = 4 (EE, EZ, ZE, ZZ) → (a).

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