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Worksheet: Spin-Active Nuclei

Q1:

Which of the following lists contains only spin-active nuclei detectable by NMR spectroscopy?

  • A 1 6 O , 1 3 C , 3 1 P
  • B 1 H , 1 2 C , 3 1 P
  • C 2 H , 1 2 C , 3 1 P
  • D 1 H , 1 3 C , 3 1 P

Q2:

Which of the following are not ๐ผ = 1 2 systems?

  • A 1 3 C
  • B 1 9 F
  • C 1 H
  • D 1 4 N

Q3:

Which of the following lists contains only spin-active nuclei detectable by NMR spectroscopy?

  • A 1 6 O , 1 3 C , 3 1 P
  • B 1 H , 1 2 C , 1 9 F
  • C 1 H , 1 2 C , 3 1 P
  • D 1 9 F , 1 3 C , 1 H

Q4:

Nuclei with even masses and odd numbers of protons and neutrons .

  • Ahave integer spins and cannot be observed by NMR
  • Bhave fractional spins and can be observed by NMR
  • Chave fractional spins and cannot be observed by NMR
  • Dhave integer spins and can be observed by NMR

Q5:

1 2 C and 1 6 O nuclei cannot be observed by NMR spectroscopy. Why?

  • AThey interact too strongly with the magnetic field.
  • BThey have low natural abundance.
  • CThey cause complex spin-spin interactions, which cannot be interpreted.
  • DThey have zero spin and yield no signal.