Edexcel A-Level Chemistry A2 15.19 Data From 13c Nmr Spectroscopy to I Predict the Different Environments for Carbon Atoms Present in a Molecule Given Values Questions

Count distinct carbon environments, use symmetry to identify equivalent atoms, and combine chemical-shift evidence with the molecular formula to deduce structures.

Exam points

Predict the number of carbon-13 NMR peaks by identifying equivalent carbon environments and molecular symmetry.
Match a carbon-13 chemical shift or range to a carbon environment and use it as evidence for a functional group.
Draw an isomer that fits the molecular formula, functional groups and peak count, then label the distinct carbon environments.
Compare peak counts and shift ranges to distinguish two structures or explain why their carbon-13 spectra cannot distinguish them.

[Maximum number: 1]

This question concerns six isomers each with the molecular formula $\mathrm{C}_{5} \mathrm{H}_{10} \mathrm{O}_{2}$ .

State the number of peaks in the carbon-13 $\left({ }^{13} \mathrm{C}\right)$ NMR spectrum of E.

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Edexcel A-Level Chemistry A2 15.19 Data From 13c Nmr Spectroscopy to I Predict the Different Environments for Carbon Atoms Present in a Molecule Given Values Questions question 1