Question

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VII.The absorption of IR radiation is accompanied by transitions involving
a)Electronic levels b) Vibrational levels c) Nuclear spin levels d) Electron spin levels​

Answer 1

Explanation:

Electronic transitions are vertical or almost vertical lines on such a plot since the electronic transition occurs so rapidly that the internuclear distance can't change much in the process. Vibrational transitions occur between different vibrational levels of the same electronic state.

a) UV absorption is attributable to electronic transitions. b) UV spectra provide information about valence electrons. c) IR absorption is attributable to transitions between rotational energy levels of whole molecules. d) ..

The normal modes of vibration are: asymmetric, symmetric, wagging, twisting, scissoring, and rocking for polyatomic molecules. Figure 1: Six types of Vibrational Modes. Images used with permission (Public Domain; Tiago Becerra Paolini).15-Aug-2020

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