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

Provide the name of the amino acid used to create the following aldehyde after its reaction with ninhydrin.

Glycine

Lysine

Threonine

Methionine

Proline

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Verified step by step guidance

Identify the structure of the aldehyde shown in the image. The structure contains a sulfur atom, which is characteristic of the amino acid methionine.

Understand the reaction of amino acids with ninhydrin. Ninhydrin reacts with amino acids to produce aldehydes, among other products.

Recognize that methionine is the only amino acid among the options provided that contains a sulfur atom, which matches the structure of the aldehyde in the image.

Recall that ninhydrin typically reacts with the amino group of amino acids, leading to the formation of an aldehyde. The presence of sulfur in the aldehyde indicates the original amino acid was methionine.

Conclude that the amino acid used to create the aldehyde shown in the image after its reaction with ninhydrin is methionine, based on the presence of the sulfur atom in the aldehyde structure.