Spectroscopy practice: NMR, IR and structure elucidation with answers
Count ¹H and ¹³C NMR signals, work out splitting with the n+1 rule, read IR bands and mass spectra, and solve full structure elucidations. Every spectrum is computed from the structure, no AI guesswork. Five problems, new every day, free and without an account.
Keep practising for free, with your progress
The basics without a daily limit in a free account, plus one exam-level task a day. Every level, the exam mode and the AI tutor from €4.99 once or with Plus.
Task
How many signals does the ¹H NMR spectrum of ethanal (acetaldehyde) show? Count the chemically different kinds of hydrogen.
Number of signals
Type whole numbers, e.g. 3. NMR shifts are typical values (±0.3 ppm), splitting follows the n+1 rule.
Topics with formulas and practiceDouble bond equivalents (DBE) · ¹H NMR: number of signals · ¹³C NMR: number of signals · Interpreting IR spectra …
How the trainer works
Type, don’t guess
Number of signals, integral, DBE or molecular mass are typed as numbers; splitting, bands and structures are chosen.
With worked solutions
After each problem every signal is explained: which group, how many neighbouring H, why it sits there. Plus the typical exam mistake.
Computed, not guessed
Over 100 molecules whose spectra chemistry software derives from the structure: equivalent H, n+1 rule, IR bands, isotope patterns. No AI, always right.