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Which of the following most likely represents the H-NMR spectrum of the molecule shown below?
  • a)
    One quartet, one triplet, two doublets, and one singlet
  • b)
    One quartet, two triplets, one doublet, and one singlet
  • c)
    One quartet, one triplet, and three doublets
  • d)
    One quartet, one triplet, one doublet, and one singlet
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Which of the following most likely represents the H-NMR spectrum of th...
  • There are four total aromatic protons, consistent with two sets of identical pairs. This would result in two distinct aromatic signals, each having a doublet and each integrating two protons.
  • The methyl protons next to the ketone would be deshielded by the electron withdrawing ketone group, resulting in a downfield shift. The signal would be a singlet, since there are no neighboring protons to the methyl group.
  • Finally, the ethyl group would have two signals, one for the two protons next to the aromatic ring (shifted downfield because of the aromatic ring), and one highly shielded peak corresponding to the terminal protons. The protons next to the aromatic ring will result in a quartet from the three neighboring hydrogens, while the terminal peak will be a triplet from the two neighboring hydrogens.
  • The final result is one quartet (ethyl), one triplet (ethyl-terminal), two doublets (aromatic), and one singlet (methyl).
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Which of the following most likely represents the H-NMR spectrum of the molecule shown below?a)One quartet, one triplet, two doublets, and one singletb)One quartet, two triplets, one doublet, and one singletc)One quartet, one triplet, and three doubletsd)One quartet, one triplet, one doublet, and one singletCorrect answer is option 'A'. Can you explain this answer?
Question Description
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