CHEMISTRY · Subjective · A Level · Chemistry · Organic analysis and spectroscopy · Organic analysis and spectroscopy
Problem
In an infrared measurement from 2μm to 20μm, the baseline gradually drifts upward, but a distinct, sharp absorption maximum is clearly visible at 4.26μm above the drifting background. Identify the molecular transition responsible for this peak and justify how you can confidently assign the transition type despite the presence of baseline drift and noise.