Lesson 3.3.15

3.3.15 Nuclear magnetic resonance spectroscopy Quiz: AQA Chemistry, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.3.15, Nuclear magnetic resonance spectroscopy: 20 multiple choice questions for the AQA Chemistry (7405), Unit 3: Organic chemistry, written with Revision Ninja.

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The 20 questions

  1. What information does NMR spectroscopy give about a molecule?

    • The bond angles only
    • The molecular mass of the compound
    • The chemical environments of 1H or 13C atoms
    • The concentration of ions in solution

  2. Why is tetramethylsilane (TMS) used as the standard in NMR?

    • It is an organic solvent that dissolves the sample and gives a strong peak within the usual range
    • It is a strong acid that protonates the sample and so removes its lone pairs before measurement
    • It is chemically inert and gives one sharp peak that appears at a shift outside the usual range of organic peaks
    • It is a metal that absorbs all the radiation, so no signal reaches the detector during measurement

  3. What unit is used for chemical shift in NMR?

    • ppm (parts per million), on the delta scale
    • cm-1, the unit of wavenumber used for infrared absorption peaks in spectra
    • Hz only, the unit of frequency used to record the chemical shifts in NMR
    • m/z, the mass-to-charge ratio used for the peaks in a mass spectrum

  4. What does the integration of a 1H NMR peak show?

    • The bond length between two atoms, which is measured from the area under the peak
    • The relative number of equivalent hydrogen atoms giving that peak
    • The molar mass of the compound, which is obtained from the integration of the peaks
    • The number of carbon atoms in the molecule, which is found from the integration

  5. Why do 13C NMR spectra usually show fewer splitting patterns than 1H NMR?

    • 13C atoms do not have any nuclear spin
    • The 13C spectrum is taken at a much higher temperature
    • 13C atoms are always in an ionic environment
    • The natural abundance of 13C is low, so adjacent 13C atoms are rare

  6. Why are deuterated solvents used in 1H NMR?

    • They are needed to remove all hydrogen atoms from the sample
    • They are the only solvents that dissolve organic compounds
    • They increase the chemical shift of the sample
    • They do not give a 1H signal that would overlap with the sample peaks

  7. How many peaks are seen in the 1H NMR spectrum of propanone?

    • 6
    • 2
    • 3
    • 1

  8. How many environments of 1H are there in ethanol, CH3CH2OH?

    • 3
    • 4
    • 1
    • 2

  9. What is the integration ratio of the three 1H environments in ethanol, CH3CH2OH?

    • 1 : 2 : 3
    • 2 : 3 : 1
    • 1 : 1 : 1
    • 3 : 2 : 1

  10. Using the n+1 rule, what is the multiplicity of a CH3 group adjacent to a CH2 group?

    • Singlet
    • Doublet
    • Triplet
    • Quartet

  11. What is the multiplicity of a CH2 group adjacent to a CH3 group?

    • Quartet
    • Triplet
    • Singlet
    • Doublet

  12. In ethyl ethanoate, what is the multiplicity of the CH3 group attached to the C=O?

    • Singlet
    • Doublet
    • Quartet
    • Triplet

  13. How many hydrogen atoms in total does ethyl ethanoate, CH3COOCH2CH3, contain?

    • 6
    • 4
    • 10
    • 8

  14. A compound shows a single 1H NMR singlet integrating for 9H. What structural feature is most likely?

    • Two separate OH groups, which give two broad signals at the same chemical shift
    • A CH2 group next to a CH3 group, which gives a quartet and a triplet in the spectrum
    • A benzene ring with nine substituents, which gives a single sharp signal in the spectrum
    • Three equivalent CH3 groups on one carbon, as in a tert-butyl group

  15. How many 13C signals are expected from butanone, CH3CH2COCH3?

    • 4
    • 5
    • 2
    • 3

  16. What is the chemical shift position of TMS in NMR?

    • 200 ppm
    • 100 ppm
    • 10 ppm
    • 0 ppm

  17. Which compound's 1H NMR spectrum shows only a triplet (3H) and a quartet (2H)?

    • Ethanoic acid, CH3COOH
    • Ethanal, CH3CHO
    • Bromoethane, CH3CH2Br
    • Ethanol, CH3CH2OH

  18. Why does chemical shift depend on the molecular environment of a hydrogen atom?

    • Chemical shift is a fixed value for all hydrogens, so it cannot tell environments apart
    • Electron-withdrawing groups nearby change the shielding of the nucleus
    • The mass of the molecule changes the shift, because heavier molecules shield the nucleus
    • The shift depends only on the solvent used, not on the structure of the molecule

  19. Why is the CH2Br group in 1-bromopropane found further downfield than the CH3 group?

    • CH2 groups always appear at the same shift as CH3 groups
    • Bromine shields the nearby protons from the magnetic field
    • Bromine is electronegative and deshields the nearby protons
    • The CH3 group is always more deshielded

  20. Why are NMR and mass spectrometry used together to confirm the structure of a compound?

    • They both identify the solvent used, so the sample can be recovered afterwards
    • They only work on ionic compounds, so they are not useful for organic molecules
    • They both measure the melting point of the compound, which confirms its purity
    • They provide complementary information on molecular mass and the environments of atoms

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