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lecture 7 - 318M Krische Lecture 7 F Ch 2 Alkanes and...

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318M – Krische, Lecture 7: F - 09/12/08, Ch. 2, Alkanes and Cycloalkanes Organic molecules are broadly classified on the basis of recurring structural motifs known as “functional groups.” A functional group is simply a grouping of atoms that exhibits similar chemical properties/reactivities. For example, the “OH” group of ethanol is characteristic of all alcohols. For a list of common organic functional groups see the on-line handout provided on the course website. Be able to identify common functional groups . The simplest class of organic molecules are the alkanes. Alkanes have the general structure C n H 2n+2 . Alkanes, and most other organic molecules, are typically represented as “line angle drawings.” In class, we learned the names of simple linear alkanes of the formula CH 3 (CH 2 ) n CH 3 . We also saw that molecules of the same formula can have “connectivities” other than that found in linear molecules. For C 5 H 12 , there are 3 possible isomers. For C 10 H 22 , there are 75 possible isomers. For
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