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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6:19 minutes

Problem 27c,d

Textbook Question

Give common names for the following compounds.
(c) 3-methyloct-4-yne
(d) (CH₃)₃C–C≡C–CH(CH₃)CH₂CH₃

Verified step by step guidance

Step 1: Understand the structure of the compound 3-methyloct-4-yne. The name indicates that it is an alkyne with a total of eight carbon atoms (oct) and a triple bond starting at the fourth carbon (4-yne). Additionally, there is a methyl group attached to the third carbon (3-methyl).

Step 2: Draw the structure of the compound based on the IUPAC name. Start by drawing a straight chain of eight carbon atoms. Then, add a triple bond between the fourth and fifth carbon atoms. Finally, attach a methyl group to the third carbon atom.

Step 3: Identify the longest continuous carbon chain that includes the triple bond. In this case, the longest chain is the octane chain with the triple bond, which is the main chain.

Step 4: Determine the common name by considering the substituents and the position of the triple bond. The common naming system often uses the name of the substituent followed by the name of the main chain, with the position of the triple bond indicated.

Step 5: Combine the substituent name with the main chain name to form the common name. The methyl group is at the third position, and the triple bond starts at the fourth position, so the common name will reflect these positions in relation to the main chain.

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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 of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry. It provides a standard way to name compounds, ensuring that each name is unique and descriptive of the compound's structure. Understanding IUPAC rules is essential for converting systematic names to common names.

Common Names in Organic Chemistry

Common names are traditional names for chemical compounds that are often derived from the source of the compound or its properties. Unlike IUPAC names, common names do not follow a systematic structure and can vary widely. Familiarity with common names is important for recognizing compounds in literature and industry.

Alkynes

Alkynes are hydrocarbons that contain at least one carbon-carbon triple bond, characterized by the suffix '-yne' in IUPAC nomenclature. They are unsaturated compounds with the general formula CnH2n-2. Understanding the structure and properties of alkynes is crucial for identifying and naming them, both systematically and commonly.

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