it essentially tells you how many pairs of hydrogens have been lost. For example one degree of unsaturation can be noticed in a double bond since it has lost 2 hydrogens. One degree of unsaturation is also noticed in a ring. This is because upon making a ring, you loose two hydrogens. 2 degrees of unsaturation are found in triple bonds...etc.
hope this helps
degrees of unsaturation basically tell you how many double bonds, triple bonds, or rings there are in a molecule, so you could have an infinite number, depending on how large the molecule is, etc.
* Rings count as one degree of unsaturation
* Double bonds count as one degree of unsaturation
* Triple bonds count as two degrees of unsaturation
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