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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7:27 minutes

Problem 5a,b

Textbook Question

Give the systematic (IUPAC) names of the following alkenes.
(a)
(b)

Verified step by step guidance

Step 1: Identify the longest carbon chain that contains the double bond for each alkene. This will be the parent chain. For compound (a), the longest chain is 5 carbons long, and for compound (b), it is 6 carbons long.

Step 2: Number the carbon atoms in the parent chain starting from the end nearest to the double bond. This ensures the lowest possible numbers for the double bond. For compound (a), the double bond starts at carbon 1, and for compound (b), it starts at carbon 1.

Step 3: Identify and name any substituents attached to the parent chain. In compound (a), there is an isopropyl group attached to carbon 4. In compound (b), there is an ethyl group attached to carbon 4.

Step 4: Combine the names of the substituents with the parent chain name, using the appropriate locants (numbers) to indicate the position of the double bond and substituents. Use the suffix '-ene' to indicate the presence of a double bond.

Step 5: Assemble the full IUPAC name by placing the substituents in alphabetical order, followed by the parent chain name with the locant for the double bond. Ensure that the name reflects the correct structure and positions of the substituents and double bond.

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Key Concepts

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

IUPAC Nomenclature

The International Union of Pure and Applied Chemistry (IUPAC) nomenclature is a systematic method for naming organic chemical compounds. It provides rules for naming alkenes based on the longest carbon chain containing the double bond, the position of the double bond, and the presence of substituents. Understanding these rules is essential for accurately identifying and communicating the structure of organic molecules.

Alkenes

Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C). They are unsaturated compounds, meaning they have fewer hydrogen atoms than alkanes with the same number of carbon atoms. The presence of the double bond affects the physical and chemical properties of alkenes, making them more reactive than alkanes, which is crucial for understanding their behavior in chemical reactions.

Substituents and Chain Length

In organic chemistry, substituents are atoms or groups of atoms that replace hydrogen atoms in a hydrocarbon chain. When naming alkenes, it is important to identify the longest continuous carbon chain that includes the double bond and to number the chain to give the lowest possible numbers to the double bond and substituents. This helps in determining the correct IUPAC name and understanding the compound's structure.

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Related Practice

Textbook Question

What is each compound's systematic name?

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

Textbook Question

The following names are all incorrect. Draw the structure represented by the incorrect name (or a consistent structure if the name is ambiguous), and give your drawing the correct name.

c. 2-methylcyclopentene

d. 6-chlorocyclohexadiene

Textbook Question

Give a correct name for each compound.

(a)

(b)

Textbook Question

Give the systematic (IUPAC) names of the following alkenes.

(d)

(e)

Textbook Question

Which of the following names are correct? Correct those that are not correct.

e. 4,4-dimethyl-2-pentyne

f. 2,5-dimethyl-3-hexyne

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.

a. 4-ethyl-2-pentyne

b. 1-bromo-4-heptyne

Textbook Question

Which of the following names are correct? Correct those that are not correct.

a. 4-heptyne

b. 2-ethyl-3-hexyne

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