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

4. Alkanes and Cycloalkanes

Naming Alkenes

Organic Chemistry

4. Alkanes and Cycloalkanes

Naming Alkenes

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4:58 minutes

Problem 40a,b,c

Textbook Question

Draw a structure for each compound (includes old and new names).
a. 3-methylpent-1-ene
b. cis-3-methyl-3-hexene
c. 3,4-dibromobut-1-ene

Verified step by step guidance

Step 1: Start with the first compound, 3-methylpent-1-ene. Identify the longest carbon chain, which is pentane (5 carbons). The '1-ene' indicates a double bond between the first and second carbon atoms.

Step 2: For 3-methylpent-1-ene, add a methyl group (CH₃) to the third carbon of the pentane chain. Ensure the double bond is between the first and second carbons.

Step 3: Move to the second compound, cis-3-methyl-3-hexene. Hexene indicates a 6-carbon chain with a double bond. The '3-hexene' specifies the double bond between the third and fourth carbons. 'Cis' means the substituents on the double-bonded carbons are on the same side.

Step 4: For cis-3-methyl-3-hexene, add a methyl group to the third carbon. Arrange the structure so that the methyl group and the hydrogen on the third carbon are on the same side as the hydrogen on the fourth carbon, maintaining the 'cis' configuration.

Step 5: Finally, for 3,4-dibromobut-1-ene, start with a butene chain (4 carbons) with a double bond between the first and second carbons. Add bromine atoms to the third and fourth carbons. Ensure the double bond is correctly placed between the first and second carbons.

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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 standardized system for naming chemical compounds. It involves identifying the longest carbon chain, numbering the chain to give substituents the lowest possible numbers, and naming substituents as prefixes. Understanding this system is crucial for drawing structures from names, as it provides a clear method to identify the arrangement of atoms in a molecule.

Alkene Structure

Alkenes are hydrocarbons containing at least one carbon-carbon double bond. The presence of this double bond affects the geometry and reactivity of the molecule. In drawing alkene structures, it's important to represent the double bond accurately and consider its position in the carbon chain, as indicated by the name, to ensure the correct molecular structure.

Cis-Trans Isomerism

Cis-trans isomerism is a form of stereoisomerism where the relative orientation of functional groups around a double bond differs. 'Cis' indicates that substituents are on the same side, while 'trans' means they are on opposite sides. This concept is essential for understanding the spatial arrangement in molecules like cis-3-methyl-3-hexene, affecting their physical and chemical properties.

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