HSC · Chemistry · Analysis of Organic Substanceslive from the app
Proton NMR and the n+1 Rule
Three pieces of information from one spectrum: shift says what kind of hydrogen, integration says how many, and splitting says how many hydrogens sit on the neighbouring carbon.
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the one idea
why this one carries the topic.
No single spectrum names a molecule. Mass spec gives the size, infrared the functional groups, NMR the carbon skeleton and its hydrogens — each one a partial witness. The skill is triangulation: stack the evidence until only one structure survives.
Proton NMR reveals hydrogen environments through chemical shift, relative numbers through integration, and neighbouring hydrogens through splitting patterns following the n+1 rule.
what examiners catch — Students misapply the n+1 rule by counting hydrogens on the same carbon instead of adjacent carbons or misread integration ratios as absolute numbers.
what you leave with
four things, not forty.
Chemical shift identifies the hydrogen environment
Integration ratio gives relative numbers of hydrogens
n+1 rule: n neighbouring H gives n+1 peaks
Singlet, doublet, triplet, quartet — read the neighbours
what's underneath
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this conceptproton nmr and the n+1 ruleProton NMR reveals hydrogen environments through chemical shift, relative numbers through integration, and neighbouring hydrogens through splitting patterns following the n+1 rule.
sits under itelectromagnetic radiation and the electromagnetic spectrumbecause radio-frequency context helps; the rule itself stands alone
built on itputting the spectra togetherbecause the second input
the rest of analysis of organic substances
6 more, same treatment.
Each one is its own knowscape in the app — built for how a particular student takes things in, not one explanation handed to everybody.
chromatographyin the appinfrared spectroscopyin the appputting the spectra togetherin the appcarbon-13 nmrin the appmass spectrometryin the appchemical tests for functional groupsin the app
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