Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

36. Synthetic Polymers

Radical Polymerization

Organic Chemistry

36. Synthetic Polymers

Radical Polymerization

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Multiple Choice

Why does back-biting result in the formation of short branches?

Back-biting results in short branches because it is faster than intermolecular chain transfer.

Intramolecular chain transfer is a controlled reaction and results in a uniform distribution of branches.

Back-biting only takes place in short chains, and therefore produce shorter branches.

Intramolecular H abstraction at the 5^th carbon produces a stable transition state.

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Verified step by step guidance

Understand the concept of back-biting: Back-biting is an intramolecular reaction where a growing polymer chain folds back on itself and abstracts a hydrogen atom from an internal carbon, leading to branching.

Identify the type of hydrogen abstraction: In the context of polymer chemistry, back-biting often involves hydrogen abstraction at a specific carbon position, such as the 5th carbon, which is crucial for forming a stable transition state.

Analyze the stability of the transition state: The stability of the transition state during back-biting is influenced by the position of hydrogen abstraction. Abstraction at the 5th carbon can lead to a more stable transition state due to favorable steric and electronic factors.

Compare with intermolecular chain transfer: Back-biting is faster than intermolecular chain transfer because it is an intramolecular process, which generally has a lower activation energy and occurs more rapidly, leading to shorter branches.

Conclude on the formation of short branches: Since back-biting occurs within short chains and is a faster process, it results in the formation of short branches, contributing to the uniform distribution of branches in the polymer.