Final answer:
The fingerprint region of an IR spectrum is located at 600-1500 cm⁻¹ and is unique to each molecule, aiding in its identification.
Step-by-step explanation:
The fingerprint region of an IR spectrum is located at 600-1500 cm⁻¹. This part of the IR spectrum is highly complex and unique to each molecule, much like an actual fingerprint. It includes a range of absorption peaks that are often specific to the individual molecule, making it useful for identifying or confirming molecular identity. However, it is difficult to associate these peaks with specific functional groups because they can encompass a variety of vibrations, including bending and twisting motions of the molecule's structure. By comparing the fingerprints in the IR spectrum of an unknown compound with the spectra of known compounds, chemists can identify the unknown substance.