Question

11. Which of the following solvent is not a vitable for 'H NMR spectroscopy?
(a) CHCI,
(b) COCH,
(c) D20
(c) C1), OD​

Answer 1

Explanation:

To avoid spectra dominated by the solvent signal, most 1H NMR spectra are recorded in a deuterated solvent. However, deuteration is not "100%", so signals for the residual protons are observed.

...

Answer 2

CHCl is not vital for H-NMR spectroscopy. (Option A)

• For H-NMR spectroscopy, only deuteron-solvents are appropriate.
• When H-NMR tests are carried out, the diamagnetism of all samples will be dominant in the spectrum.
• A solvent with few H nuclei, such as per-floro acetic acid, can be employed in some cases. The proton's chemical change would happen well downfield, allowing a window for the required spectrum.
• The deuterium signal is also used to lock the frequency in modern NMR spectrometers.
• Deuteron solvents (aside from chloroform-d) are notoriously costly, and the more expensive ones tend to gather after an experiment before being distilled and reused (which of course is a very good practice both in terms of economy and the environment).
• As a result, CHCl isn't required for H-NMR spectroscopy.