UPSC Civil Services (Mains), Chemistry optional · 2025 · Paper II
Q2(b)(ii). Styrene with BrCCl₃ under light
Question
Write the structure of the major product(s) formed in the following reaction (styrene with BrCCl₃, hν). Justify your answer.
Model answer
The free solution for 2025 answers questions 1, 3, 5, 6 and 8, the ones picked in its time plan. Question 2 is answered in full in the Chemistry Paper II, 2021 to 2025 book, with every part of every paper.
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UPSC Civil Services (Main) Chemistry Paper II: Model Answers 2021 to 2025
- All eight questions of each paper, with the question printed above its answer
- Mechanisms drawn out and labelled on the scheme
- Topic-wise weightage and a topic-wise index
CoversKharasch additionfree-radical additionBrCCl3styrenebenzylic radical
All parts of Question 2
- 2(a) Ester shift with sodium ethoxide; cyclisation of an epoxy-diene15 marks
- 2(b)(i) Acid-catalysed hydration of 3,3-dimethylbut-1-ene10 marks
- 2(b)(ii) Styrene with BrCCl₃ under light5 marks
- 2(c) Products of four reactions20 marks