UPSC Combined Geo-Scientist, Mains · 2024 · Mains Paper III
Q10(a)(ii). Benzophenone with aluminium isopropoxide at 250 °C
Question
Predict the products C and D in the given reaction scheme [(i) and (ii)]. Provide the suitable mechanisms for both the reactions: (ii) benzophenone + [(CH₃)₂CHO]₃Al, 250 °C → D. [structure given in the paper]
Model answer
The free solution for 2024 answers questions 1, 4, 5, 6, 7 and 9, the ones picked in its time plan. Question 10 is answered in full in the Geo-Scientist Chemistry Paper III, 2021 to 2025 book, with every part of every paper.
Part of VKC Basic
Read the key points and the full model answer with VKC Basic
VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.
Printed copy and Kindle
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
CoversMeerwein–Ponndorf–Verley reductionaluminium isopropoxidehydride transferbenzophenone
All parts of Question 10
- 10(a)(i) Anisole with dibromocarbene: ring expansion to a tropone5 marks
- 10(a)(ii) Benzophenone with aluminium isopropoxide at 250 °C5 marks
- 10(b) Structure from ¹H and ¹³C NMR: C₁₅H₁₄O5 marks
- 10(c) Band width and colour; ν(C=O) of acids and ketones5 marks
- 10(d)(i) Mass spectral fragmentation of an ester and a cyclohexene5 marks
- 10(d)(ii) Structure from IR, ¹H and ¹³C NMR: C₁₀H₉NO₂5 marks