Which of the following statements is true concerning infrared spectroscopy?
1
Functional groups can be identified by looking in the fingerprint region of the spectrum.
2
It shines infrared light on a compound and records the position, where the light is blocked by the compound. This results in the spectrum peaks.
3
It is useful in determining the size and shape of a compound's carbon skeleton.
4
When the infrared light frequency matches the frequency of bond vibration in a molecule, a peak is recorded on the spectrum.