NMR Spectroscopy
What is shielding in NMR?

Using a curved piece of metal to block an opponents attack
Blocking parts of a molecule from Rf radiation
Putting metal around an Rf source
When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei

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NMR Spectroscopy
Coupling causes the peaks in 1H NMR spectra to be split into

multiple peaks equal to the number of hydrogens on surrounding atoms
multiple peaks equal to the number of hydrogen on surrounding atoms, plus one
two peaks
multiple peaks equal to the number of surrounding carbon atoms

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