Lesson 6.3.2

6.3.2 Spectroscopy Quiz: OCR Chemistry, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.3.2, Spectroscopy: 20 multiple choice questions for the OCR Chemistry (H432), Unit 5: Organic chemistry and analysis, written with Revision Ninja.

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The 20 questions

  1. Which compound is used as the standard reference for chemical shifts in NMR spectroscopy?

    • Deuterium oxide
    • Trichloromethane
    • Tetrachromate
    • Tetramethylsilane

  2. Why is deuterated chloroform used as a solvent in proton NMR spectroscopy?

    • Higher boiling point
    • No proton peaks
    • Faster dissolution
    • Stronger polarity

  3. Which reagent is added to a proton NMR sample to identify O–H or N–H protons?

    • Tetramethylsilane
    • Deuterium oxide
    • Sodium hydroxide
    • Concentrated sulfuric acid

  4. What does each signal represent in a proton-decoupled carbon-13 NMR spectrum?

    • One carbon environment
    • One hydrogen environment
    • One functional group
    • One adjacent carbon

  5. According to the n + 1 rule, how many peaks does a proton give if it has three non-equivalent adjacent protons?

    • Four
    • Three
    • Two
    • Six

  6. How many carbon environments are there in propan-2-ol, CH3CH(OH)CH3?

    • Four
    • Two
    • Three
    • One

  7. How many carbon environments are there in ethyl ethanoate, CH3COOCH2CH3?

    • Five
    • Four
    • Two
    • Three

  8. How many proton environments are there in ethanol, CH3CH2OH?

    • Five
    • Two
    • Three
    • Four

  9. What integration ratio is expected for the proton NMR spectrum of ethanol, CH3CH2OH?

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

  10. What splitting pattern is shown by the CH3 protons in the proton NMR spectrum of ethanol?

    • Singlet
    • Triplet
    • Quartet
    • Doublet

  11. How many peaks are present in the proton NMR spectrum of propanone, CH3COCH3?

    • 6
    • 1
    • 2
    • 3

  12. A compound has the formula C4H8O2 and shows two singlets in its proton NMR spectrum, one with an area ratio of 3 and one with 3. What is the most likely compound?

    • Butanoic acid, CH3CH2CH2COOH
    • Butane-1,4-diol
    • Ethyl ethanoate, CH3COOCH2CH3
    • Methyl ethanoate, CH3COOCH3

  13. How many peaks are in the proton NMR spectrum of ethanoic acid, CH3COOH?

    • 1
    • 4
    • 3
    • 2

  14. Which compound is used as the standard reference assigned 0 ppm in NMR spectroscopy?

    • Tetramethylsilane
    • Deuterated chloroform
    • Trichloromethane
    • Ethanol

  15. A compound with formula C3H6O gives a single peak in its proton NMR spectrum. Which compound is it?

    • Propan-1-ol, CH3CH2CH2OH
    • Propanone, CH3COCH3
    • Propanal, CH3CH2CHO
    • Methyl ethanoate, CH3COOCH3

  16. What splitting pattern is shown by the CH2 protons in ethanol, CH3CH2OH?

    • Singlet
    • Quartet
    • Triplet
    • Doublet

  17. How many carbon environments are there in methylbenzene, C6H5CH3?

    • Four
    • Seven
    • Five
    • Six

  18. What information does the integration trace in a proton NMR spectrum provide?

    • Number of neighbours
    • Relative proton numbers
    • Functional group type
    • Carbon chain length

  19. What splitting pattern is observed for the methyl protons in 2-bromopropane, CH3CHBrCH3?

    • Doublet
    • Septet
    • Triplet
    • Singlet

  20. At what chemical shift range do aromatic ring protons typically appear in proton NMR spectra?

    • 3.0–4.4 ppm
    • 6.0–8.5 ppm
    • 0.5–1.9 ppm
    • 9.0–10.0 ppm

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