**Spectroscopy: Analyzing IR Spectra for Caffeine and Adenine**Attached are the infrared (IR) spectra for caffeine and adenine. Please follow these instructions:1. **Identify Each Compound:** - Use the molecular structures available in the Lab Manual (page 34) to name each compound displayed at the bottom of each spectrum box.2. **Label Major Peaks:** - Identify and label the major peaks with the corresponding functional groups for each spectrum.**Spectrum Details:**- **Top Graph:** - The x-axis represents the wavenumber in cm⁻¹, ranging from 4000 to 500. - The y-axis shows transmittance as a percentage, from 0% to 100%. - Each peak within the spectrum corresponds to different molecular vibrations, indicating functional groups present in the compound. - Refer to the provided table for precise wavenumber values, which may correlate to specific functional groups.- **Bottom Graph:** - Similar layout as the top graph, with the same x and y axes. - Again, each peak corresponds to specific molecular vibrations and helps identify functional groups. - The table accompanying the graph provides accurate wavenumber values essential for peak assignment.For both spectra, analyze the peaks and utilize the tables to assist in peak identification. Look for characteristic peaks that could indicate the presence of functional groups such as C-H, N-H, or C=O bonds. These identifications are crucial in distinguishing caffeine from adenine and understanding their molecular structures.

The structure of caffeine and adenine are represented as below: Caffeine is represented by the second IR spectrum. The functional groups present in caffeine are: C-H (aliphatic), C=O, C-N, C=N. The base range lies at 3000-2840 cm-1 for aliphatic C-H bond, 1680-1650 cm-1, for C=O (lactam), 1250-1020 cm-1 for C-N and 1690-1640 cm-1 for C=N, 1450-1375 for C-H bending.Adenine is represented by the first IR spectrum. The functional groups present in adenine are: C-H (aliphatic), C=O, C-N, C=N. The broad spectrum around 3500-2000 cm-1 is representative of strong hydrogen bonding. The peaks at 3300-3100 cm-1 represents N-H stretches, 2950 cm-1 for =C-H stretch, 1600 cm-1 N-H bending vibrations, 1250-1020 cm-1 for C-N and 1690-1640 cm-1 for C=N.