UPSC Combined Geo-Scientist, Mains · 2026 · Mains Paper III
Q9(c). Ziegler–Natta polymerisation of ethylene
Question
Propose the mechanism for polymerization of alkene C₂H₄ when treated with Ziegler–Natta catalyst. Predict the nature of conductivity of the formed polymer and justify your answer.
Model answer
The free solution for 2026 answers the questions picked in its time plan. Question 9 is answered in full in the Book Edition of the 2026 solutions of Geo-Scientist Chemistry Paper III.
Coverscoordination polymerisationZiegler–Natta polymerisation of ethylene
All parts of Question 9
- 9(a) Diels–Alder of a quinone; ring opening and cycloaddition of a cyclobutene10 marks
- 9(b) Ionone mass spectrum; HWE, DIBAL-H and Sharpless sequence10 marks
- 9(c) Ziegler–Natta polymerisation of ethylene10 marks