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

29. Amino Acids

Reactions of Amino Acids: Ninhydrin Test

Organic Chemistry

29. Amino Acids

Reactions of Amino Acids: Ninhydrin Test

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Multiple Choice

Name the aldehyde formed when isoleucine reacts with ninhydrin.

(R)-2-methylbutanal

Pentanal

(S)-2-methylbutanal

(S)-3-methylbutanal

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Verified step by step guidance

Identify the reactants: The first reactant is ninhydrin, a common reagent used to detect amino acids. The second reactant is isoleucine, an amino acid with a specific stereochemistry at its chiral center.

Understand the reaction: Ninhydrin reacts with amino acids to form an aldehyde, carbon dioxide, and ammonia. This reaction is often used in amino acid analysis.

Determine the structure of the aldehyde: The reaction with ninhydrin typically involves the decarboxylation of the amino acid, leading to the formation of an aldehyde. In this case, the side chain of isoleucine will form the aldehyde.

Consider the stereochemistry: Isoleucine has a chiral center, and the reaction with ninhydrin will retain the stereochemistry of the side chain. Therefore, the aldehyde formed will have the same stereochemistry as the original chiral center in isoleucine.

Name the aldehyde: Based on the structure and stereochemistry, the aldehyde formed is (S)-2-methylbutanal, as the reaction retains the stereochemistry of the original chiral center in isoleucine.