IR Spectroscopy Fundamentals
Explore the principles of Infrared (IR) Spectroscopy, identifying functional groups, and interpreting IR spectra.
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IR Spectroscopy Fundamentals
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Read each question carefully and answer to the best of your ability. For multiple-choice questions, select the best option. For fill-in-the-blanks, provide the correct term. For short answer questions, write your response in the space provided.
1. Which type of molecular vibration is primarily responsible for IR absorption?
Electronic transitions
Vibrational transitions
Rotational transitions
Nuclear spin transitions
2. What is the typical unit for wavenumber in IR spectroscopy?
nm
Hz
cm⁻¹
ppm
1. IR spectroscopy is used to identify groups in a molecule.
2. A molecule must have a change in moment during a vibration to be IR active.
1. All molecular vibrations absorb IR radiation.
True
False
2. The 'fingerprint region' of an IR spectrum is typically found below 1500 cm⁻¹.
True
False
1. Briefly explain the basic principle of how IR spectroscopy works.
2. Name two functional groups that produce strong, characteristic absorption bands in an IR spectrum.
Match the IR absorption range with the corresponding functional group.
1. 3300 cm⁻¹ (broad)
a. C=O (carbonyl)
2. 1700 cm⁻¹ (strong)
b. O-H (alcohol)
3. 2200 cm⁻¹ (medium)
c. C≡N (nitrile)