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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2:49 minutes

Problem 27a

Textbook Question

Identify the allylic carbon(s) in the following molecules.
(a)

Verified step by step guidance

Step 1: Recall the definition of an allylic carbon. An allylic carbon is a carbon atom that is directly adjacent to a carbon-carbon double bond (C=C). This means it is one bond away from the double bond.

Step 2: Examine the structure of the molecule provided in part (a). Locate the carbon-carbon double bond (C=C) in the molecule.

Step 3: Identify all carbon atoms that are directly bonded to the carbon atoms involved in the double bond. These are the allylic carbons.

Step 4: Verify that the identified allylic carbons are not part of the double bond itself. Allylic carbons are adjacent to the double bond, not part of it.

Step 5: Highlight or mark the allylic carbons in the structure for clarity and ensure no other carbons meet the criteria of being adjacent to the double bond.

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Key Concepts

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

Allylic Carbon

An allylic carbon is a carbon atom that is directly adjacent to a carbon-carbon double bond (C=C). In organic chemistry, these carbons are significant because they can participate in various reactions, such as allylic substitutions, due to their unique reactivity. Identifying allylic carbons is crucial for understanding reaction mechanisms and predicting the outcomes of chemical reactions.

Double Bond Structure

The double bond structure consists of two shared pairs of electrons between two carbon atoms, denoted as C=C. This structure not only influences the geometry of the molecule, making it planar around the double bond, but also affects the reactivity of the molecule. Recognizing the position and nature of double bonds is essential for identifying allylic carbons and understanding their role in organic reactions.

Molecular Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms within a molecule. The presence of double bonds and lone pairs can alter the bond angles and overall shape of the molecule, impacting its reactivity and interactions. Understanding molecular geometry is vital for visualizing the location of allylic carbons and predicting how they will behave in chemical reactions.

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