In NMR, the dependence of the resonance position of a nucleus that results from
ID: 506881 • Letter: I
Question
In NMR, the dependence of the resonance position of a nucleus that results from molecular environment is called chemical shift. In NMR, an external magnetic field affects the motion of the electrons in a molecule and the induced magnetic field of the electrons in the carbon-hydrogen bond reinforces the external magnetic field. Infrared spectroscopy is a useful tool to determine presence of some of unique functional groups in a molecule. From a biochemical perspective, the most important oxidation is the conversion of thiols to sulfoxides.Explanation / Answer
(7). In NMR, the dependence of the resonance position of a nucleus that results from molecular environment
is called chemical shift.
= True
[ Because NMR deals with the interaction between a molecule, whose nuclear spins have been aligned in a magnetic field. In this, the valence electrons around a particular nucleus and around neighboring nuclei respond to the applied magnetic field for shielding the nucleus from the applied field. The way this shielding occurs can be quantified in which is the proportionality constant. It is important to recognize that is not a nuclear property but depends on the chemical environment of the atom. ]
(8). In NMR, an external magnetic field affects the motion of the electrons in a molecule and the induced magnetic field of the electrons in the carbon-hydrogen bond reinforces the external magnetic field.
= False
[Because the electrons provide the shielding to the nucleus from the external magnetic field instead of reinforcing it by their induced magnetic field.]
(9). Infrared Spectroscopy is a useful tool to determine the presence of some of unique functional groups in a molecule.
= True
[ Infrared Spectroscopy measures the vibrations of atoms and based on this it is possible to determine the functional groups.]
(10). From the biochemical perspective, the most important oxidation is the conversion of thiols to sulfoxide.
= True
[Because this type of oxidation (the conversion of thiols to sulfoxide) belongs to the living beings metabolism.]
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