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Bond Vibrations, IR Spectroscopy, and the “Ball and Spring” Model
via members.masterorganicchemistry

In This Post Why do UV spectra have such broad peaks? The “stadium” analogy. Introduction to vibrational energy levels. Visualizing different vibrational energy levels A useful analogy: the “ball and spring” model for bond vibrations IR spectroscopy...

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periodic trends - Why does chlorine have a higher electron affinity than fluorine? - Chemistry Stack Exchange

Since fluorine has its valence electrons in the n=2 energy level, and since chlorine has its valence electrons in the n=3 energy level, one would initially expect that an electron rushing towards

organic chemistry - Baldwin's rules exceptions: cations - Chemistry Stack Exchange

Why do cations violate Baldwin's rules? For example, the following acetalization mechanism is plausible even though it contains a 5-endo-trig step: Image taken from: Clayden, J. Organic Chemistry;