“Spectroscopy Never Lies”: Classroom Study on Real-World Problems with UG and PG Students

Fundamental concepts of spectroscopy are routinely taught at the undergraduate (UG) and postgraduate (PG) levels in chemistry curricula across higher educational institutions. However, a deeper and more practical understanding of spectroscopy often develops only when students enter research environments, such as Ph.D. programs or project-based work, where they encounter the spectral interpretation of newly synthesized compounds. In this context, the real challenge begins when the observed spectral data diverge from theoretical predictions, requiring students to rationalize discrepancies and possibly revise the structural assignments. Herein, we present detailed analyses of this matter from our own experiences including 1H NMR and ESI-MS spectroscopy to illustrate how such discrepancies can be approached pedagogically. Recognizing the growing importance of biological sciences, we presented a multistep synthesis protocol of two significant molecules: quinic acid, a mannose-mimicking compound, and a lipopeptide designed for targeted gene delivery to tumor-associated blood vessels. Both undergraduate and postgraduate students were individually involved via quasi-experimental design. Through session-wise MCQ-based evaluations, students critically assessed real, imperfect data, fostering a deeper understanding beyond common curriculum-based concepts. Surveys and analyses highlighted variations in concept understanding between UG and PG students, while feedback sessions showed support for adding this topic to the curriculum and identified areas requiring improvement in the pedagogical approach. We hope that integrating examples of intriguing molecules, particularly those that produce unexpected spectroscopic results during laboratory synthesis, will enhance students’ critical thinking and analytical skills. Such experiences also help them appreciate and manage experimental uncertainty. These abilities are essential for future work in spectroscopy-based structural elucidation and in the multistep synthesis of important molecules.