Worksheet: Spin-Active Nuclei

In this worksheet, we will practice identifying spin values of common nuclei and common properties of nuclides with zero, half-integer, and integer spins.

Q1:

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

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

Q2:

Which of the following is not a 𝐼=12 system?

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

Q3:

1 2 C and 16O nuclei cannot be observed by NMR spectroscopy. Why?

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

Q4:

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

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

Q5:

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

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

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