An anticipated IR absorption band may not be observed because

Question

Quizplus · Accepted Answer

An anticipated IR absorption band may not be observed for any of the reasons mentioned in the choices A to D, or a combination of these reasons. The band may be outside the range of the instrument, or there may be no change in the dipole moment during the vibration, or the band may be eclipsed by another. In addition, weak intensity may make it difficult to distinguish the band from instrument noise. Thus, any of these situations, or a combination of them, may prevent the observation of an anticipated IR absorption band.

An Anticipated IR Absorption Band May Not Be Observed Because