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Nuclear magnetic resonance spectroscopy (A-level only)
This A-level-only topic uses spectroscopy to identify organic structures.
4
Objectives
20
Flashcards
20
Questions
90 min
Study time
AQAA LevelChemistryOrganic chemistry
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Start revising Nuclear magnetic resonance spectroscopy (A-level only)
Syllabus checklist
What you need to know
4 objective pages available
NMR spectroscopy (A-level only)4 objectives
- Use carbon-13 NMR spectra to identify carbon environments.
- Use proton NMR chemical shifts to identify proton environments.
- Interpret integration and splitting patterns.
- Use NMR evidence with other analytical data to determine structures.
Key terms
carbon-13 NMR spectrumchemical shiftintegrationproton NMRsplitting patternNMR spectroscopycarbon-13 NMR
Exam tips
- Identify Carbon Environments: Practice interpreting carbon-13 NMR spectra by identifying the number of peaks and their chemical shifts.
- Integration and Splitting Patterns: Explain clearly by review how to analyze integration values and splitting patterns in carbon-13 NMR spectra to deduce the number of hydrogen atoms attached to each carbon. Link the point to NMR spectroscopy (A-level only), then state the evidence, calculation, mechanism, observation, or conclusion required by the question.
Common mistakes
- Misidentifying Carbon Environments: 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.
- Ignoring Integration Values: To correct this, always analyze the integration values alongside the chemical shifts. Use the integration values to determine the relative number of carbons in each environment, which aids in constructing the molecular structure.
Practice preview
- What does the chemical shift in a carbon-13 NMR spectrum indicate about a carbon atom?
- In carbon-13 NMR spectroscopy, what does a peak at a higher chemical shift (δ) typically indicate?
- How can you determine the number of different carbon environments in a molecule using carbon-13 NMR?
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