Q9(d). Four conversions: structures of the products
Write the structure of the product(s) in the following conversions: (i) [ester] with NaOEt, EtOH → P; dilute HCl, Δ → Q; (ii) [diene] with mCPBA → A; i. LiAlH₄, ii. NH₄Cl/H₂O → B; (iii) [amino-alkene] with OsO₄ → M; NaIO₄ → N; (iv) [labelled diketone, * = labelled carbon] with NaOCH₃, CH₃OH → R. [structures given in the paper]
Model answer
The free solution for 2022 answers questions 1, 4, 5, 6, 7 and 10, the ones picked in its time plan. Question 9 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
CoversDieckmann condensationepoxide opening LiAlH₄glycol cleavage NaIO₄benzilic ester rearrangementisotopic labelling
All parts of Question 9
- 9(a) Gramine route to indole-3-acetic acid; photolysis of cyclodecanone10 marks
- 9(b) Cannizzaro reaction: effect of para substituents on the rate5 marks
- 9(c) IR: C=C stretch of small-ring alkenes; class of a nitrogen compound5 marks
- 9(d) Four conversions: structures of the products10 marks