Question detail
What information can be derived from the integration of peaks in a carbon-13 NMR spectrum?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Nuclear magnetic resonance spectroscopy (A-level only)
Question
- A. The relative number of each type of carbon environment
- B. The relative number of protons attached to each carbon
- C. The number of carbon atoms in the molecule
- D. The molecular weight of the compound
Answer
The relative number of each type of carbon environment
Explanation
The correct option is The relative number of each type of carbon environment. The relative number of each type of carbon environment is the best answer because it directly supports the AQA A-Level Chemistry objective to use carbon-13 NMR spectra to identify carbon environments. This reasoning is anchored to NMR spectroscopy (A-level only) in Nuclear magnetic resonance spectroscopy (A-level only), and it separates NMR from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Misidentifying Carbon Environments
Students often confuse the chemical shifts of different carbon environments, leading to incorrect identification of carbon types in a molecule.
To fix this, refer to a reliable table of carbon-13 NMR chemical shifts. Identify the environment by matching the chemical shift value to the corresponding carbon type, ensuring to consider the molecular structure.
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