Degrees of Unsaturation (14 min)

This tutorial shows you how, just based on a molecular formula, you can quickly and easily propose possibilities for a molecule's structure. This technique will come in handy when doing spectroscopy problems. (Runtime = 14:21)

Student Learning Outcomes
After viewing this tutorial and practicing problems from this website and your textbook, you should be able to:
• Determine the degrees of unsaturation (a.k.a. index of hydrogen deficiency) of a molecule given its structure or molecular formula.
• Use degrees of unsaturation to propose valid structures for an unknown compound.

Practice Problems
Here are some problems to get you started. You should first try each on a piece of paper. Then, place your cursor over the graphic and click on right arrow that appears to see the answer. The right and left arrows allow you to move back and forth between problems. Please note that these are not the only types of problems/questions that exist on this topic. Refer to your textbook and any problems your instructor provides you for more practice with this subject.


© Thomas Poon 1999