Discussion
Why is a deuterated solvent used rather than the ordinary one?
Answer: C
Two reasons run together: a protonated solvent would swamp the analyte with a signal thousands of times larger, and the deuterium resonance is what the lock channel follows. Deuterated and ordinary solvents dissolve compounds equally well, since the chemistry is unchanged, and no solvent threatens the magnet, which never touches the sample. The analyte shifts hardly at all. Residual protonated solvent still gives a small peak at a known position, and those residual peak positions are tabulated precisely so they can be recognised and ignored.
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