index_hydrogen_defic

index_hydrogen_defic - CHM 2201 Organic Chemistry Lab I...

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1 How to Calculate the "Index of Hydrogen Deficiency" (also known as the "Units of Unsaturation") Given a Molecular Formula Overview : Frequently, a great deal can be learned about an unknown substance simply from knowledge of its molecular formula. This information is based on the following general molecular formulas. acyclic alkane cycloalkane or alkene cyclic alkene, diene, or alkyne, for example C n H 2n+2 C H 2n C H 2n-2 Difference of 2 hydrogens Difference of 2 hydrogens Notice that each time a ring or a ! bond is introduced into a molecule, the number of hydrogens in the molecular formula is reduced by two . For every triple bond (two ! bonds) introduced into a molecule, the number of hydrogens in the molecular formula is reduced by four . When the molecular formula for a compound contains non-carbon or non- hydrogen elements, the ratio of carbon to hydrogen may change. Following are three simple rules that may be used to predict how this ratio will change. 1.
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This note was uploaded on 02/20/2012 for the course CHE 118B 118 taught by Professor Nasiri during the Winter '11 term at UC Davis.

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index_hydrogen_defic - CHM 2201 Organic Chemistry Lab I...

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