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I am studying NMR and the concept of chemical equivalence is confusing. What does it mean exactly? Does it involve having different atoms to the left, right, up and down of a particular hydrogen in question? Please explain. Also I don't understand diastereotopic hydrogen give two shift? Like wouldn't rotating the bonds give same chemical environment to the two hydrogen giving them one signal. I am confused.

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closed as too broad by Jan, Klaus-Dieter Warzecha, Todd Minehardt, getafix, Zhe Feb 13 '17 at 4:13

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Homotopic, Enantiotopic, Diastereotopic - masterorganicchemistry.com/2012/04/17/… $\endgroup$ – MaxW Feb 11 '17 at 20:07
  • $\begingroup$ In reference to NMR, chemical environment would be something that causes H peak to shift or split. $\endgroup$ – MaxW Feb 11 '17 at 20:08
  • $\begingroup$ Chemical and Magnetic Equivalence - u-of-o-nmr-facility.blogspot.com/2008/08/… $\endgroup$ – MaxW Feb 11 '17 at 20:11
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    $\begingroup$ The two questions are only mildly related; you should separate them into two different questions. Incidentally, I’m sure the diastereotopic-hydrogens-two-signals-question has been asked before on here. $\endgroup$ – Jan Feb 12 '17 at 20:55