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Analytical Techniques
Quick questions on Carbon-13 NMR spectroscopy: Singapore A-Level H2 Chemistry
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are number of peaks?Show answer
The number of peaks equals the number of chemically distinct carbon environments. The key step is recognising symmetry: carbons that are equivalent by symmetry give a single peak.
What is chemical shift?Show answer
Each peak's chemical shift (from the data-booklet table) indicates the type of carbon. Rough guide:
What is q1?Show answer
State how many peaks the carbon-13 NMR spectrum of 2,2-dimethylpropane, , would show and explain. [2 marks]
What is q2?Show answer
A carbon-13 peak appears at ppm. State the type of carbon it indicates. [1 mark]
What is q3?Show answer
Explain why carbon-13 NMR can distinguish propan-1-ol from propan-2-ol. [2 marks]
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