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

The following aldehyde is obtained from the reaction between an amino acid and ninhydrin. Select the structure of the amino acid used initially.

structure of amino acid

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Verified step by step guidance

Identify the structure of the aldehyde obtained from the reaction. The aldehyde shown has a benzene ring with a hydroxyl group (OH) and an aldehyde group (CHO) attached to it.

Understand the reaction between an amino acid and ninhydrin. Ninhydrin reacts with amino acids to produce a colored compound and an aldehyde. The aldehyde formed is typically derived from the side chain of the amino acid.

Analyze the structure of the aldehyde to determine the side chain of the amino acid. The aldehyde has a benzene ring with a hydroxyl group, indicating that the side chain of the amino acid must contain a similar structure.

Examine the provided amino acid structures to find one that matches the side chain of the aldehyde. Look for an amino acid with a benzene ring and a hydroxyl group in its side chain.

Select the amino acid that has a side chain structure matching the aldehyde. In this case, the amino acid with a phenolic side chain (a benzene ring with a hydroxyl group) is tyrosine.