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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 · 2021 · Paper II, Chemistry · Q92 of 120

Geo-Scientist Prelims 2021 Chemistry Q92: A sample of lactic acid was found to have an enantiomeric excess…

QuestionStereochemistry / enantiomeric excess

A sample of lactic acid was found to have an enantiomeric excess (ee) of 14% with respect to R (+) isomer. What is the percentage of S (–) isomer in the sample?

  1. (a) 86
  2. (b) 57
  3. (c) 43
  4. (d) 72

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