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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5:27 minutes

Problem 30e,f

Textbook Question

Draw a condensed structure for each of the following:
e. methoxyethyne
f. sec-butyl-tert-butylacetylene

Verified step by step guidance

Step 1: Understand the problem. You are tasked with drawing condensed structures for two compounds: methoxyethyne and sec-butyl-tert-butylacetylene. Condensed structures represent molecules in a compact form, showing connectivity without explicitly drawing bonds.

Step 2: Break down methoxyethyne. The name 'methoxyethyne' indicates the presence of a methoxy group (-OCH₃) attached to ethyne (C≡CH). Ethyne is a two-carbon alkyne with a triple bond between the carbons. Place the methoxy group on one of the carbons.

Step 3: Write the condensed structure for methoxyethyne. Combine the methoxy group (-OCH₃) with the ethyne backbone (C≡CH). The condensed structure will show the connectivity of the methoxy group to the ethyne.

Step 4: Break down sec-butyl-tert-butylacetylene. The name indicates an acetylene (C≡C) with two substituents: a sec-butyl group and a tert-butyl group. Sec-butyl is a four-carbon group attached via the second carbon, and tert-butyl is a four-carbon group attached via the central carbon. Attach these groups to the acetylene backbone.

Step 5: Write the condensed structure for sec-butyl-tert-butylacetylene. Combine the acetylene backbone (C≡C) with the sec-butyl and tert-butyl groups. Ensure the connectivity reflects the correct attachment points for each substituent.

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Key Concepts

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

Condensed Structural Formula

A condensed structural formula is a way of representing a chemical compound that shows the arrangement of atoms and the connectivity between them without depicting all the bonds explicitly. It typically groups atoms together to indicate how they are connected, making it easier to visualize the structure of organic molecules. For example, in methoxyethyne, the condensed formula would reflect the presence of both the methoxy group (-OCH3) and the ethyne (acetylene) structure.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In the case of methoxyethyne, the methoxy group (-OCH3) is a functional group that influences the compound's reactivity and properties. Understanding functional groups is essential for predicting how a compound will behave in chemical reactions and for drawing accurate structures.

Alkynes

Alkynes are a class of hydrocarbons that contain at least one carbon-carbon triple bond. They are characterized by the general formula CnH2n-2 and exhibit unique properties and reactivity due to the presence of the triple bond. In the context of the question, sec-butyl-tert-butylacetylene involves alkynes, and recognizing the structure and behavior of alkynes is crucial for accurately drawing their condensed structures.

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