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Analyzing Absorptions and Chemical Shifts in NMR Spectroscopy

Learn about the number of absorptions in 13C and 1H NMR, expected chemical shifts, and multiplicity of neighbors in NMR spectroscopy.

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Analyzing Absorptions and Chemical Shifts in NMR Spectroscopy

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  1. How many absorptions appear in the 13C NMR of this compound?

  2. How many absorptions appear in the 1H NMR for it?

  3. How many absorptions appear in the 13C NMR of this compound?

  4. How many absorptions appear in the 1H NMR for it?

  5. How many absorptions appear in the 1H NMR for it?

  6. How many absorptions appear in the 13C NMR of this compound?

  7. How many absorptions appear in the 1H NMR for it?

  8. Chemical Shifts What would be the expected chemical shift for the circled protons in ppm?  a. ~1.5 b. ~ 2.5 c. ~5 d. ~7.5

  9. Chemical Shifts What would be the expected chemical shift for the circled protons in ppm?  a. ~1.5 b. ~ 2.5 c. ~5 d. ~7.5

  10. Chemical Shifts What would be the expected chemical shift for the circled protons in ppm?  a. ~1.5 b. ~ 2.5 c. ~5 d. ~7.5

  11. Multiplicity neighbors # peaks multiplet a. 2, 3, doublet b. 2, 2, doublet c. 2, 1, singlet d. 2, 3, triplet

  12. Multiplicity neighbors # peaks multiplet a. 2, 3, doublet b. 2, 2, doublet c. 3, 4, quartet d. 2, 3, triplet

  13. Multiplicity neighbors # peaks multiplet a. 0, 1, singlet b. 1, 2, doublet c. 1, 1, singlet d. 1, 0, singlet

  14. Multiplicity neighbors # peaks multiplet a. 0, 1, singlet b. 1, 2, doublet c. 1, 1, singlet d. 1, 0, singlet

  15. Multiplicity • If the following splitting pattern was observed for an absorption of 2 protons on the C of an alkyl chloride, what group is alkyl group is likely to be attached? • ClCH2CH2 b. ClCH2CH c. ClCH2CH3 • ClCH2C

  16. Multiplicity • If the following splitting pattern was observed for an absorption of 2 protons on the C of an alkyl chloride, what group is alkyl group is likely to be attached? • ClCH2CH2 b. ClCH2CH c. ClCH2CH3 • ClCH2C

  17. Multiplicity • For a methine (CH), the following splitting pattern was observed. How many H’s are on the adjacent C’s?

  18. # of Lines in 13C

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