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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 · 2026 · Paper II, Chemistry · Q105 of 120

Geo-Scientist Prelims 2026 Chemistry Q105: Consider the following statements :

QuestionStereochemistry / stereospecific addition

Consider the following statements :

  1. The anti-addition of a symmetric reagent to a symmetric cis-alkene gives racemic product
  2. The anti-addition of a symmetric reagent to a symmetric trans-alkene gives racemic product
  3. The syn-addition of a symmetric reagent to a symmetric cis-alkene gives racemic product
  4. The syn-addition of a symmetric reagent to a symmetric trans-alkene gives meso product

How many of the above statement(s) is/are true ?

  1. (a) Only one
  2. (b) Only two
  3. (c) Only three
  4. (d) All of the above

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