Engineering Chemistry Unit 2 – Spectroscopic Techniques and Stereochemistry: AKTU previous year questions
47 AKTU questions from Unit 2 (Spectroscopic Techniques and Stereochemistry) asked in 2021–2026, tagged by marks, year and topic. In short: about 26 marks of every paper come from this unit; the most asked topic is UV Spectroscopy (15 times); 36 questions came back in a later year. The latest ones are listed below; on the page you can filter them by 2-mark or long questions, topic and repeats.
Unit 2 previous year questions
- A solution of concentration 1.5 x 10⁻⁴ mol/L shows absorbance of 0.6 at 400 nm in a cell of 1 cm path length. Calculate the molar extinction coefficient. (2 marks, 2026, UV Spectroscopy)
- Analyse the ¹H NMR spectra of the following compounds and predict the number of signals, their multiplicity and chemical shift values: (i) CH₃CH₂Br (ii) (CH₃)₂CHOH (7 marks, 2026, NMR Spectroscopy)
- Explain how IR spectroscopy is used to identify functional groups in organic compounds. Give at least four examples with their characteristic absorption frequencies. (7 marks, 2026, IR Spectroscopy)
- With the help of UV-Visible spectroscopy, explain why 1,3-butadiene absorbs at a longer wavelength than ethylene. What is the effect of conjugation on λmax? (7 marks, 2026, UV Spectroscopy)
- How many NMR signals are expected in each of the following compounds – CH3CH2CH2Br, CH3OCH3 (2 marks, 2025, NMR Spectroscopy)
- Can a molecule be chiral in one environment but achiral in another? Provide a theoretical example. (2 marks, 2025, Optical Isomerism)
- Among H2, HCl, CO2, H2O molecules identify which will be IR active and why? Explain the different type of vibrations observed in CO2. (7 marks, 2025, IR Spectroscopy)
- Two enantiomers of a drug have different half-lives in the body. Explain the biochemical basis for this phenomenon. (7 marks, 2025, Optical Isomerism)
- Asymmetrically substituted compounds having even number of cumulative double bonds exhibit optical isomerism whereas compounds having odd number of double bonds exhibit geometrical isomerism. Explain giving proper reasons. (7 marks, 2025, Optical Isomerism)
- How can a combination of UV, IR, and NMR spectroscopy be used to determine the structure of an unknown organic compound? Illustrate with an example. (7 marks, 2025, NMR Spectroscopy)
- Why Tetra Methyl Silane is used as reference in NMR spectroscopy? Give the number of 1H NMR signals and their splitting pattern in the following compounds: (i) (CH3)3COCH3 (ii) CH3CH(Cl)CH2Cl (iii) CH3COOH (iv) C6H5OH. (7 marks, 2025, NMR Spectroscopy)
- A compound has the molecular formula C₄H₈O₂. It shows a singlet at 3.8 ppm and a quartet at 1.2 ppm in its ¹H NMR spectrum. Predict its structure and justify your answer. (7 marks, 2025, NMR Spectroscopy)
Most asked Unit 2 topics
- UV Spectroscopy – asked 15 times
- IR Spectroscopy – asked 14 times
- NMR Spectroscopy – asked 11 times
Unit 2 question pattern
- 2-mark questions: 17 asked in 2021–2026
- 7-mark questions: 21 asked in 2021–2026
- 10-mark questions: 9 asked in 2021–2026
- About 26 marks from Unit 2 in every paper
- 36 questions were asked again in a later year
Unit 2 questions year by year
- 2026: 4 Unit 2 questions asked (23 marks across that year's papers)
- 2025: 8 Unit 2 questions asked (46 marks across that year's papers)
- 2024: 10 Unit 2 questions asked (50 marks across that year's papers)
- 2023: 10 Unit 2 questions asked (50 marks across that year's papers)
- 2022: 10 Unit 2 questions asked (68 marks across that year's papers)
- 2021: 5 Unit 2 questions asked (34 marks across that year's papers)