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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7:31 minutes

Problem 31c

Textbook Question

A student was given the structural formulas of several compounds and was asked to give them systematic names. How many did she name correctly? Correct those that are misnamed.
c. 2-methyl-3-hexyne d. 3-pentyne

Verified step by step guidance

Step 1: Recall the IUPAC naming rules for alkynes. The parent chain must be the longest continuous chain containing the triple bond, and the chain is numbered to give the triple bond the lowest possible locant (position number). Substituents are named and numbered accordingly.

Step 2: Analyze compound c (2-methyl-3-hexyne). Identify the parent chain, which is a six-carbon chain (hex-). The triple bond is at position 3, and there is a methyl group at position 2. Verify if the numbering gives the triple bond the lowest possible locant. If not, renumber the chain and correct the name.

Step 3: Analyze compound d (3-pentyne). Identify the parent chain, which is a five-carbon chain (pent-). The triple bond is at position 3. Verify if the numbering gives the triple bond the lowest possible locant. If not, renumber the chain and correct the name.

Step 4: For both compounds, ensure that the substituents and triple bond positions are correctly named according to the IUPAC rules. If any errors are found, adjust the names accordingly.

Step 5: Compare the corrected names to the original names provided. Determine how many names were correct and list the corrected names for any misnamed compounds.

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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 rules for naming based on the structure of the molecule, including the longest carbon chain, functional groups, and the position of substituents. Understanding these rules is essential for accurately naming compounds and identifying any errors in given names.

Alkynes

Alkynes are a class of hydrocarbons characterized by at least one carbon-carbon triple bond. They follow the general formula CnH2n-2 and are named based on the longest carbon chain containing the triple bond. Recognizing the structure and naming conventions for alkynes is crucial for determining the correctness of the provided names.

Substituent Positioning

In organic nomenclature, the position of substituents on the main carbon chain is indicated by numbers. The lowest possible numbers are assigned to the substituents and functional groups to reflect their positions accurately. Misnaming can occur if the positions are incorrectly identified, making it important to verify these details when naming compounds.

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