NMR Spectrum of CH3 CH2 OH: Characterizing 3 Spectral Line Bunches

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Discussion Overview

The discussion centers around the NMR spectrum of CH3 CH2 OH, specifically focusing on the characterization of the spectral line bunches and the factors influencing their splitting. The scope includes theoretical aspects of NMR spectroscopy and the application of rules related to spin-spin coupling.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant states that the NMR spectrum consists of 3 bunches of spectral lines and questions the number of lines corresponding to the CH2 group, suggesting the answer is 4.
  • Another participant asks why the lines split, indicating a need for clarification on the underlying principles.
  • A reference to spin-spin coupling is provided, linking to an external source for further explanation.
  • A later reply reiterates the initial claim about the spectral lines and emphasizes the role of coupling and the n+1 rule in determining the number of lines.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the exact number of spectral lines and the reasons for their splitting, with multiple viewpoints on the interpretation of the n+1 rule and its application to this case. The discussion remains unresolved.

Contextual Notes

There are limitations in the discussion, including assumptions about the audience's familiarity with NMR principles and the lack of detailed mathematical derivations for the spectral line counts.

athithi
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The NMR spectrum of CH3 CH2 OH consists of 3 bunches of spectral lines. the number of spectral lines in the bunch correspoding to CH2 group is ...?

Answer is 4...how to do this ?...
 
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First of all - why do the lines split?
 
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In this case, http://en.wikipedia.org/wiki/Proton_NMR" regarding spin-spin coupling.
 
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athithi said:
The NMR spectrum of CH3 CH2 OH consists of 3 bunches of spectral lines. the number of spectral lines in the bunch correspoding to CH2 group is ...?

Answer is 4...how to do this ?...

There's coupling involved, look at the hydrogens connected on the "neighboring carbon". The wikipedia has an explanation for how that works. There's also a n+1 rule that works similarly for this situation.
 

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