How can I determine the equivalence with a mirror plane in the molecule?

Answer 1

I take it you are asking this on the basis of an NMR experiment?

Enantiotopic nuclei are equivalent (i.e., isochronous) and should produce the same chemical shifts in all achiral NMR experiments; however, if a homochiral NMR solvent (i.e., an optically active NMR solvent, which does exist) is used, their interaction with the enantiotopic nuclei is diastereotopic, and the enantiotopic nuclei may be differentiated and become non-equivalent. Protons and carbon nuclei exchanged (only) by a mirror plane are said to be enantiotopic (i.e., interchanged by an improper axis of rotation).

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Answer 2

To determine the equivalence with a mirror plane in a molecule, examine the molecule's symmetry. If a mirror plane bisects the molecule in such a way that one half is the mirror image of the other, any atoms or groups on one side of the mirror plane will be equivalent to those on the other side. This symmetry indicates equivalence with the mirror plane.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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