Infrared Spectroscopy Fundamentals

Infrared Spectroscopy Fundamentals

Read each question carefully and provide your best answer. Use your knowledge of infrared spectroscopy to complete the tasks.

Infrared (IR) spectroscopy is a powerful analytical technique used to identify organic compounds. It works by measuring the absorption of infrared radiation by a sample, which causes molecular vibrations. Different functional groups within a molecule absorb IR radiation at characteristic frequencies, producing a unique 'fingerprint' spectrum.

1. Which of the following best describes the fundamental principle of IR spectroscopy?

2. The region of an IR spectrum that is most useful for identifying specific functional groups is typically:

3. In IR spectroscopy, the   region (typically 1500-400 cm⁻¹) is unique to each molecule and is difficult to interpret, but confirms identity.

4. The units for wavenumber in IR spectroscopy are typically  .

5. A strong absorption band around 1700 cm⁻¹ in an IR spectrum is characteristic of a   functional group.

6. Explain why some molecular vibrations are IR active while others are IR inactive.

7. Briefly describe one practical application of IR spectroscopy in a real-world scenario.

8. All bonds in a molecule vibrate at the same frequency.

9. IR spectroscopy can be used to distinguish between cis and trans isomers.