Q4. The propionic acid had not been incorporated intact, or there would have been 13C-13C coupling. We must conclude that the propionic acid had been broken down and the label scrambled, so the experiment was unsuccessful. Propionic acid is easily degraded to acetic acid. When using propionic acid it is much safer to use it labelled in the carboxyl group. See Question 7 below for an example.

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