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Timberlake LecturePLUS 19991 Chapter 10 Alkanes and Aromatic Hydrocarbons Branched Alkanes Structural Formulas

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Timberlake LecturePLUS 19992 Alkyl Groups Branches on carbon chains H H C CH 3 methyl H H H H C C CH 3 CH 2 ethyl H H

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Timberlake LecturePLUS 19993 Branched Alkanes CH 3 CH 3 CHCH 3 methyl groups CH 3 CH 3 CH 3 CHCH 2 CHCH 3

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Timberlake LecturePLUS 19994 Naming Branched Alkanes CH 3 methyl branch CH 3 CH 2 CH 2 CHCH 2 CH 3 6 5 4 3 2 1Count

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Timberlake LecturePLUS 19995 Naming Branched Alkanes CH 3 methyl branch CH 3 CH 2 CH 2 CHCH 2 CH 3 6 5 4 3 2 1Count 3-Methylhexane on third C CH 3 six carbon chain group

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Timberlake LecturePLUS 19996 Naming Summary 1. Count the C’s in the longest chain 2. Name each attached group 3 Count the longest carbon chain to give the first attached group the smallest number 4. Name and locate each group

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Timberlake LecturePLUS 19997 Learning Check Alk4 A. CH 3 CH 3 CH 3 CHCH 2 CHCH 3 B. CH 3 CH 3 CH 3 CH 2 CHCH 2 CCH 2 CH 3 CH 3

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Timberlake LecturePLUS 19998 Solution Alk4 A. CH 3 CH 3 CH 3 CHCH 2 CHCH 3 2,4-dimethylpentane B. CH 3 CH 3 CH 3 CH 2 CHCH 2 CCH 2 CH 3 CH 3 3,3,5-trimethylheptane

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Timberlake LecturePLUS 19999 Learning Check Alk5 Write a condensed structure for A. 3,4-dimethylheptane B. 2,2-dimethyloctane

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Timberlake LecturePLUS 199910 Solution Alk5 A. 3,4-dimethylheptane CH 3 CH 3 CH 2 CHCHCH 2 CH 2 CH 3 CH 3 B.2,2-dimethyloctane CH 3 CH 3 CCH 2 CH 2 CH 2 CH 2 CH 2 CH 3 CH 3

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Timberlake LecturePLUS 199911 Learning Check Alk6 Write 3 isomers of C 5 H 12 and name each.

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Timberlake LecturePLUS 199912 Solution Alk6 CH 3 CH 2 CH 2 CH 2 CH 3 pentane CH 3 CH 3 CHCH 2 CH 3 2-methylbutane CH 3 CH 3 CCH 3 2,2-dimethylpropane CH 3

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Timberlake LecturePLUS 199913 Isomers Same molecular formula Same number and types of atoms Different arrangement of atoms

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Timberlake LecturePLUS 199914 Examples of Isomers The formula C 4 H 10 has two different structures CH 3 CH 3 CH 2 CH 2 CH 3 CH 3 CHCH 3 Butane 2-methylpropane When a CH 3 is is used to form a branch, it makes a new isomer of C 4 H 10.

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Timberlake LecturePLUS 199915 Learning Check Alk7 Write the structural formulas of 3 isomers that have the formula C 5 H 12. Name each.

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Timberlake LecturePLUS 199916 Solution Alk7 Write the structural formulas of 3 isomers that have the formula C 5 H 12. Name each. CH 3 CH 2 CH 2 CH 2 CH 3 pentane CH 3 CH 3 CH 3 CHCH 2 CH 3 CH 3 CCH 3 CH 3 2-methylbutane 2,2-dimethylpropane

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Organic Chemistry Structural isomers Naming Branched Alkanes.

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