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Infrared versus NMR

If you needed to distinguish each of the compounds in the following pairs ( A & B ) from each other, which spectroscopic method (infrared or 1H nmr would be best (most certain)? Assume that you do not have a reference sample of either compound for direct comparison.

Compound A
Compound B
IR
NMR
Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 1 Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 2
Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 3

Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 4

Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 5		 Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 6
Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 7 Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 8

Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 9		 Virtual Textbook: Practice Problems — Selecting a Spectroscopic Tool I, figure 10




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