Mass Spectrometry & Infrared Spectroscopy: Alkyl & Carbonyl Groups


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An unknown hydrocarbon has peaks at m/z = 29 and 43, and an M+ peak at m/z = 58 in the mass spectrum. What is the chemical formula for the hydrocarbon?

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1. The mass spectrum of 2-hexanone has its largest peak at m/z = 43 rather than at m/z = 100 (M+ ). Why is this?

2. A molecule has no peaks near 3000 cm-1 in its IR spectrum. What we can say about this molecule?

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About This Quiz & Worksheet

Use the worksheet and quiz to check your understanding of mass spectrometry and infrared spectroscopy. Molecules and formulas are on the quiz.

Quiz & Worksheet Goals

Take the quiz to see what you know about:

  • Molecule that will have a C=O peak at the lowest frequency in the IR spectrum
  • Chemical formula for a hydrocarbon
  • Assessing different molecules

Skills Practiced

  • Information recall - access the knowledge you have gained about what IR spectroscopy looks at when investigating molecular structure
  • Reading comprehension - ensure that you draw the most important information from the lesson on mass spectrometry and IR spectroscopy
  • Knowledge application - use your knowledge to answer questions about alkyl and carbonyl groups

Additional Learning

You can review more if you access the lesson called Mass Spectrometry & Infrared Spectroscopy: Alkyl & Carbonyl Groups. Objectives you can complete include:

  • Examine the purpose of mass spectrometry
  • Review attributes of a hydrocarbon
  • Identify components of the carbonyl group