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A free tutorial on reading a proton (¹H) NMR spectrum by asking four questions in order: where the signals are (chemical shift), how big each one is (integration), how many lines it has (multiplicity and the n + 1 rule) and how far apart the lines are (coupling constants). It works through the spectrum of ethyl acetate and shows how to tell it from its isomer methyl propanoate.

Later sections, for upper-division students, cover Karplus relations, AB and ABX patterns and quantitative NMR. A seven-minute read; no account or software is needed to use it.

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