IB Chemistry HL 3.2.11 Hl Nmr Splitting Patterns Questions

Use proton-NMR splitting to identify singlets, doublets, triplets and quartets, infer neighbouring hydrogen counts and justify multiplicities from molecular structure.

Exam points

Predict or identify singlet, doublet, triplet, quartet or multiplet patterns for specified proton environments from the molecular structure.
Infer the number of neighbouring hydrogen atoms from a splitting pattern and apply the n+1 relationship to assign adjacent proton environments.
Explain an observed splitting pattern using neighbouring-proton coupling, equivalent spin orientations and the structure around the signal.

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Study 3.2.11 (HL)—NMR splitting patterns conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Urea, $\left(\mathrm{H}_{2} \mathrm{~N}\right)_{2} \mathrm{CO}$ , is excreted by mammals and can be used as a fertilizer.

Predict the splitting pattern of the ${ }^{1} \mathrm{H}$ NMR spectrum of urea.

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IB Chemistry HL 3.2.11 Hl Nmr Splitting Patterns Questions question 1