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Unformatted text preview: chemical shift. Different functional groups have characteristic chemical shifts . 4. Equivalent hydrogen atoms in a molecule give the same NMR signal. Equivalent hydrogen atoms in a molecule have an identical relationship to all the other atoms in the molecule, and are found on the same sp3 atom (bond rotation makes them equivalent) or entire groups are equivalent due to symmetry in the molecule (i.e. the six equivalent hydrogens on the two methyls of an isopropyl group). Determining how many equivalent hydrogens are in a molecule can be very tricky (Skull and Crossbones!) so PRACTICE. 6. The size (integration ) of the signal in an 1H NMR spectrum is proportional to the number of equivalent hydrogens in each signal....
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- Spring '10