Spectroscopy - Physical Chemistry
Card 0 of 1
Alkynes exhibit a distinctive peak in the 
region of an IR spectrum, caused by the stretching of the triple bond. After performing a synthesis of ethyne in the laboratory, she takes an infrared spectrum of the synthesized compound and no such peak appears. Which of the following statements best explains the reason for this phenomenon?
Alkynes exhibit a distinctive peak in the
Infrared spectroscopes uses dipole changes as a means of recording data. Because ethyne has a center of symmetry about its triple bond, there is no net dipole change when the bond stretches, and therefore no signal is measured by the detector. Such molecules are called IR inactive and a Raman spectrum must be obtained in order to observe the desired peaks.
Infrared spectroscopes uses dipole changes as a means of recording data. Because ethyne has a center of symmetry about its triple bond, there is no net dipole change when the bond stretches, and therefore no signal is measured by the detector. Such molecules are called IR inactive and a Raman spectrum must be obtained in order to observe the desired peaks.
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