Class 12 Chemistry · Chapter 14 · Test 2
Interpreting 1H NMR
49 MCQs
49 questions · 40 min · 49 marks
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Sample questions
The first 5 of 49. Try each one, then tap to see the answer.
Question 1
The number of peaks in a 1H NMR spectrum equals the number of:
- ADifferent proton environments
- BCarbon atoms
- CTotal protons
- DNeighbouring carbons
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Answer: A
Each peak stands for a different chemical environment.
Question 2
The primary purpose of measuring the peak area in 1H NMR is to find the:
- AChemical shift
- BNumber of neighbouring protons
- CTotal carbon atoms
- DRelative number of protons
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Answer: D
The area under each peak is proportional to the number of protons.
Question 3
A low-resolution 1H NMR spectrum gives which three pieces of information?
- AMass and charge and colour
- BNumber of environments, types of environment and relative number of protons
- CBond lengths and angles
- DMelting point and density
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Answer: B
These are the three main pieces of information.
Question 4
The area under each peak is proportional to the:
- AChemical shift
- BNumber of carbons
- CNumber of protons giving rise to that peak
- DMolecular mass
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Answer: C
Peak areas are used as integration ratios.
Question 5
The peak area ratio of OH : CH2 : CH3 in the spectrum of ethanol is:
- A3:2:1
- B2:1:3
- C1:3:2
- D1:2:3
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Answer: D
Ethanol has 1 OH proton and 2 CH2 protons and 3 CH3 protons.
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