Question detail
How can you determine the number of different carbon environments in a molecule using carbon-13 NMR?
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. Count the number of peaks in the spectrum
- B. Measure the area under each peak
- C. Analyze the splitting patterns of the peaks
- D. Identify the integration values of the peaks
Answer
Count the number of peaks in the spectrum
Explanation
The correct option is Count the number of peaks in the spectrum. Count the number of peaks in the spectrum 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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