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Which is correct? i. The number of NMR signals tells how many different types of protons are present in a molecule. ii. The area under an NMR signal is directly related to the number of protons causing the signal. iii. The position of an NMR signal tells us something about the electronic environment of each kind of proton.
Accepted Answer
All three statements are correct.
I. Number of NMR signals: The number of distinct NMR signals in a spectrum corresponds to the number of different types of protons in the molecule. Protons in different chemical environments (e.g., attached to different functional groups) will resonate at different frequencies.
II. Area under the signal: The area under each NMR signal is proportional to the number of protons giving rise to that signal. This is known as integration, and it helps determine the relative number of each type of proton present in the molecule.
III. Position of the signal: The chemical shift (position) of an NMR signal is influenced by the electronic environment of the proton. Protons near electronegative atoms or in different functional groups will experience different shielding and therefore resonate at different positions on the spectrum.
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