Organic Chemistry I Notes 8.28.13.docx

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Department
Chemistry
Course
CHM 2110
Professor
Professor Ketcha
Semester
Summer

Description
Organic Chemistry Notes II 8.28.13 Kekule Structures: bonding electrons are represented by a line. (usually lone pairs are left out) Pi Bonding: double/triple bonds ex) Ethane: C H , Et2en6: C H , Ethyn2: 4 H 2 2 Valid Lewis Structures Contain - Total number of valence elctrons shown - Sum of valence electron around each number atom is 2 - Sum of the valence elctrons (ponding, pairs and lone pairs) around each carbon, N, O, or halogen atom is 8. The Octet Rule. CO :2C (4 valence) + 2 O (6 valence) = 16 electrons .. .. O : : C : : O .. .. HCN: H(1) + C(4) + N(5) = 10 electrons H .. C :: N: .. H 2O : 2 H (1) + C (4) + O (6) = 12 electrons H..C..H :: :O: Formal Charge = (# valence elctrons) – (# half bonding
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