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Unformatted text preview: CHE 131 Lecture 16, 2/27/2006 1 Lecture 16 Examples of Molecules with Multiple Bonds (8.4, 8.5) Some Naturally Occuring Molecules Bond Properties (8.6) Bond Lengths, Bond Enthalpies, Bond Polarity Benjamin S. Hsiao Department of Chemistry Stony Brook University Lecture 16, Knowledge and Skills Hydrocarbons and other molecules with and multiple bonds Isomerism (constitutional, geometric) Recognize molecules that can exist as geometric isomers Differentiate classes and properties of fats based on structural characteristics Some physical properties of isomers Bond properties: bond length bond enthalpies bond polarity and electronegativity of elements Multiple Covalent Bonds in Hydrocarbons Double Bonds: Alkenes ethene 1-propene Non-rotation around C = C nearly CHE 131 Lecture 16, 2/27/2006 2 Alkenes: Butene 2-butene C C H H C C H H H H H H 1-butene H C H H C C H H C H H H H C C CH3 H CH3 cis-2-butene trans-2-butene H3C CH3 H H H3C H H CH3 constitutional isomers geometric isomers...
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- Spring '06