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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2021 · Mains Paper III

Q6(a). Reactivity of four alkenes towards electrophilic addition

Question

Arrange the following alkenes in increasing order of reactivity toward electrophilic addition reactions. Also give justification for the answer. CH₃CH=CH₂, CCl₃CH=CH₂, ClCH₂CH=CH₂, Cl₂CHCH=CH₂

Answer in brief

CCl₃CH=CH₂ < Cl₂CHCH=CH₂ < ClCH₂CH=CH₂ < CH₃CH=CH₂ (most reactive).

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Topic notes: addition to alkenes and alkynes (Markovnikov, stereochemistry, dienes), with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverselectrophilic additionalkene reactivityinductive effectcarbocation stability

All parts of Question 6