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

18. Aromaticity

Naming Benzene Rings

Organic Chemistry

18. Aromaticity

Naming Benzene Rings

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1:36 minutes

Problem 1c,d

Textbook Question

Draw the structure for each of the following:
c. 3-benzylpentane
d. bromomethylbenzene

Verified step by step guidance

Step 1: Understand the naming conventions for the compounds. For 3-benzylpentane, 'benzyl' refers to a benzene ring attached to a CH2 group, and 'pentane' is a straight-chain alkane with five carbon atoms. The '3-' indicates that the benzyl group is attached to the third carbon of the pentane chain.

Step 2: Draw the pentane backbone. Represent it as a straight chain of five carbon atoms: CH3-CH2-CH2-CH2-CH3.

Step 3: Attach the benzyl group to the third carbon of the pentane chain. The benzyl group consists of a benzene ring (C6H5) attached to a CH2 group. Replace one hydrogen atom on the third carbon of the pentane chain with the benzyl group.

Step 4: For bromomethylbenzene, recognize that the name indicates a benzene ring with a bromomethyl group (-CH2Br) attached. The bromomethyl group consists of a CH2 group bonded to a bromine atom.

Step 5: Draw the benzene ring (a hexagon with alternating double bonds) and attach the bromomethyl group (-CH2Br) to one of the carbons on the benzene ring. Ensure the structure reflects the correct bonding and connectivity.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

IUPAC Nomenclature

IUPAC nomenclature is a systematic method for naming organic chemical compounds. It provides a set of rules to derive the names of compounds based on their structure, including the identification of the longest carbon chain and the correct placement of substituents. Understanding these rules is essential for accurately interpreting and drawing chemical structures.

Structural Representation

Structural representation refers to the way in which the arrangement of atoms in a molecule is depicted. This can include line-angle formulas, condensed formulas, or three-dimensional models. For the compounds in the question, it is important to visualize how substituents like benzyl and bromomethyl are attached to the main carbon chain.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In the context of the question, recognizing the benzyl group (a phenyl group attached to a CH2) and the bromomethyl group (a CH2Br group) is crucial for accurately drawing the structures of 3-benzylpentane and bromomethylbenzene.

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