Q9(c). IR: C=C stretch of small-ring alkenes; class of a nitrogen compound
(i) Arrange the following compounds in order of increasing value of C=C stretching frequency: [structures I to IV of small-ring alkenes given in the paper]. (ii) A nitrogen-containing compound shows no absorption band at 3400 cm⁻¹ and no absorption bands between 1700 cm⁻¹ and 1600 cm⁻¹. What class of compound is it?
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
CoversIR C=C stretchingring straincyclopropenecyclobutenetertiary amine
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