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 is directly determined from the chemical shift values in NMR spectra?

    • Relative molecular mass
    • Bond dissociation energy
    • Environment of atoms
    • Empirical formula

  2. Why is tetramethylsilane used as a standard reference signal in NMR spectroscopy?

    • Multi-peak splitting
    • High boiling point
    • Unreactive single peak
    • Coloured solution

  3. What unit is used to measure chemical shift on an NMR spectrum?

    • Parts per million
    • Grams per mole
    • Hertz per metre
    • Joules per mole

  4. What does the integrated area under a peak in proton NMR spectroscopy show?

    • Coupling constant
    • Relative hydrogen count
    • Carbon chain length
    • Bond enthalpy

  5. Why is carbon-carbon spin-spin splitting rarely observed in carbon-13 NMR spectra?

    • High electronegativity
    • Large atomic radius
    • Zero nuclear spin
    • Low natural abundance

  6. Why is CDCl3 used as a solvent in proton NMR spectroscopy instead of CHCl3?

    • Low density
    • Strong acidity
    • High boiling point
    • No proton signal

  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 single peak integrating for nine protons in proton NMR indicates which structural group?

    • Isopropyl group
    • Phenyl group
    • Ethyl group
    • 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. What effect causes different chemical shifts for nuclei in different environments in NMR?

    • Molecular mass
    • Electron shielding
    • Nuclear spin
    • Spin coupling

  19. Why do protons near electronegative atoms shift downfield in 1H NMR spectroscopy?

    • Spin-spin coupling
    • Shielding
    • Deshielding
    • Hydrogen bonding

  20. Which analytical technique identifies different carbon and hydrogen environments in organic compounds?

    • Infrared spectroscopy
    • Gas chromatography
    • Mass spectrometry
    • NMR spectroscopy

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