Engineering Chemistry Unit 2 – Spectroscopic Techniques and Stereochemistry: important questions for AKTU
Unit 2 (Spectroscopic Techniques and Stereochemistry) questions that AKTU repeats most often. This unit carries about 26 marks per paper. Start with the repeated questions, then the most asked topics.
Most repeated Unit 2 questions
- (i) Explain the basic principle of IR Spectroscopy. What is the significance of Fingerprint region in IR spectroscopy? (ii) Identify the chromophoric groups present in cyclopentene, toluene, butanone and methanethiol in UV spectroscopy. (7 marks, 2023, IR Spectroscopy) – also asked in 2021, 2022, 2024, 2025, 2026
- 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) – also asked in 2022, 2023, 2024, 2025
- Write the criteria for a molecule to show Raman, IR, Rotational and UV Spectra. Give the possible electronic transitions (UV spectra) in CH3CH2CH3, CH3CH=CH2, CH3CH=O and CH3-CH=CH-CH=CH-CH3. How many fundamental Vibrational degrees of freedom are expected for the following molecules: CO2, H2O and C2H? (10 marks, 2021, UV Spectroscopy) – also asked in 2022, 2023, 2024, 2025, 2026
Most important Unit 2 topic
- UV Spectroscopy (Unit 2: Spectroscopic Techniques and Stereochemistry) – asked 15 times in 2021, 2022, 2023, 2024, 2026
Most asked Unit 2 topics
- UV Spectroscopy – asked 15 times
- IR Spectroscopy – asked 14 times
- NMR Spectroscopy – asked 11 times
More 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)
- 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)
Unit 2 syllabus topics
- UV Spectroscopy
- IR Spectroscopy
- NMR Spectroscopy
- Optical Isomerism
- Geometrical Isomerism