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Chapter 4 - Chapter 4.1 4.2 4.9-4.13 Alkanes 4.1 and 4.2...

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Chapter 4.1, 4.2, 4.9-4.13 Alkanes 4.1 and 4.2 Intro and Classification General Molecular Formula: Let’s quickly revisit Constitutional Isomers by drawing the structures for the 3 constitutional isomers with the formula C 5 H 12 : Classification of Carbon Atoms according to the number of attached carbons: a carbon bonded to one carbon __________________________ a carbon bonded to two carbons _________________________ a carbon bonded to three carbons _________________________ a carbon bonded to four carbons _________________________
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Practice Set for Classification: Classify the carbon atoms in 2,2,4-trimethylpentane. 4.9-4.13 - Conformational Analysis Atoms and bonds tend to repel each other due to electrostatic repulsion between their electron clouds. A molecule experiences strain when the electron clouds of atoms in the molecule are too close in proximity to each other ; this is known as steric strain . To minimize steric strain, the bonds and atoms in a molecule prefer to be as far away from each other as possible. Conformational Analysis is the study of the energy relations between conformers of a molecule. Conformers are equivalent structures (not isomers) that arise as a result of the rotation about a C-C single bond. One useful way to depict
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