Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is the percentage of the 13C isotope in natural carbon?

πŸ’‘ Hint: Recall the common isotopic distribution in carbon.

Question 2

Easy

What does a single signal in 13C NMR indicate?

πŸ’‘ Hint: Think about symmetry in molecular structures.

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Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is the main purpose of 13C NMR spectroscopy?

  • To determine molecular weight
  • To analyze carbon frameworks
  • To identify infrared spectra

πŸ’‘ Hint: Think about what specific information NMR provides.

Question 2

True or False: The area under the peaks in a 13C NMR relates directly to the number of carbon atoms.

  • True
  • False

πŸ’‘ Hint: Consider how integration functions differently in NMR types.

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Challenge Problems

Push your limits with challenges.

Question 1

You have a 13C NMR spectrum with signals at 0, 20, 130, and 200 ppm. Propose a possible structure for a molecule with these chemical shifts.

πŸ’‘ Hint: Refer to the characteristic ranges for functional groups to guide you.

Question 2

Calculate and interpret the degree of unsaturation for a molecule with a molecular formula of C8H8 based on the presence of signals in the 13C NMR.

πŸ’‘ Hint: Count the number of hydrogens and relate it to unsaturation.

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