True, You can typically get your original sample back when utilizing functional group tests and elemental analysis to try to figure out a compound's structure.
In an elemental analysis, the sodium test, also known as Lassaigne's test, is used to determine whether certain foreign elements, such as halogens, nitrogen, sulfur, and phosphorus, are present in an organic compound.
The four primary methods are mass spectrometry, nuclear magnetic resonance (NMR) spectroscopy, infrared (IR), and ultraviolet and visible spectroscopy. A minimal amount of sample is required for spectroscopy, and after an IR, NMR, or UV spectrum has been generated, the sample can be reused.
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