Question detail
In carbon-13 NMR spectroscopy, what does a peak at a higher chemical shift (δ) typically indicate?
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 carbon is bonded to electronegative atoms
- B. The carbon is part of an alkane
- C. The carbon is in a more reduced environment
- D. The carbon is part of a cyclic structure
Answer
The carbon is bonded to electronegative atoms
Explanation
The correct option is The carbon is bonded to electronegative atoms. The carbon is bonded to electronegative atoms 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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