UPSC Combined Geo-Scientist, Mains · 2023 · Mains Paper III
Q8(c). Radical polymerisation of ethene; how branches form
Question
Explain the mechanism of free radical polymerization of ethylene. How will you explain the formation of branchings in the resulting polymer?
Model answer
The free solution for 2023 answers questions 1, 4, 5, 6, 7 and 10, the ones picked in its time plan. Question 8 is answered in full in the Geo-Scientist Chemistry Paper III, 2021 to 2025 book, with every part of every paper.
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UPSC Combined Geo-Scientist (Main) Chemistry Paper III: Model Answers 2021 to 2025
- All ten questions of each paper, with the question printed above its answer
- Instruments drawn as labelled diagrams, numericals worked with units
- Topic-wise weightage and a topic-wise index
Coversfree radical polymerisationpolyethylenechain transferbackbitingLDPE branching
All parts of Question 8
- 8(a) Birch reduction of anisole, then hydrolysis of the enol ether10 marks
- 8(b) Two C₅H₁₂O alcohols told apart by α-cleavage5 marks
- 8(c) Radical polymerisation of ethene; how branches form5 marks
- 8(d) Double Mannich reaction: ring closure to a 4-piperidone10 marks