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I refer to a good response on the general question "Discrete variables in regression model? found on a sister site. The quote in part: General confusion appears when you mix in ordinal data, such as those 5-point "how satisfied are you?" questions. They are expressed in whole number, very easily to be confused with discrete data. However, ...

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I'm not sure why you think they are enantiomers. They are actuallually diastereomers as stated: As depicted, the compound to the left is $(2R,3S)$- while the compound to the right is $(2R,3R)$-. Thus, they are pair of diastereomers. To be enantiomers, either the compound to the left should be $(2S,3S)$- or the compound to the right should be $(2S,3R)$-.

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There's a great open access paper from 2020 on the subject: "Understanding Trends in Molecular Bond Angles" J. Phys. Chem. A 2020, 124, 7, 1306–1311 The authors calculated a wide variety of species using accurate quantum chemical methods (CASSCF/CASPT2 method, ANO-RCC basis set). They rationalize the trends as a function of the polarizability of ...

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My error was that I read the $$\vec{e}_{ij}$$ vectors as if they were canonical vectors. Especially I implicitly assumed that $$\vec{e}_{31} \cdot \vec{e}_{32} = 0$$ Which is of course wrong. If one inserts $$\vec{e}_{31} \cdot \vec{e}_{32} = \cos(\phi)$$ the correct expression is obtained.

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The "expanded structure" is the expansion of condensed structural formula. For example, the expanded structure of the condensed structure $\ce{CH3CH2CH3}$ is given below along with the lewis structure Basically, the lewis structure has been simplified by representing the two electron covalent by a dash $—$ instead of dots. Lewis structure ...

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