Which one of the following pieces of information cannot be obtained from an infra-red spectrum?
Everyday Science / Branch of Science — Multiple-choice practice
- A. The molecular mass
- B. The presence of O-H bonds
- C. The presence of C=O bonds
- D. The identity of a compound through comparison with other spectra
Correct answer
The molecular mass
Explanation
Explanation Infrared (IR) spectroscopy is excellent at identifying functional groups in a molecule, like C=O and O-H bonds, by detecting their characteristic vibrational frequencies. It can also help identify a compound by comparing its IR spectrum to reference spectra of known compounds. However, IR spectroscopy does not provide information about the molecular mass of a compound.
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