Question:
Which of the following compounds give a positive neutral FeCl\(_3\) test?
Which of the following compounds give a positive neutral FeCl\(_3\) test?
Updated On: Apr 9, 2026
- Threonine
- Cysteine
- Tyrosine
- Serine
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The Correct Option is C
Solution and Explanation
The neutral FeCl\(_3\) test is commonly used to detect phenolic compounds. The phenolic group (\(-OH\) attached to an aromatic ring) reacts with FeCl\(_3\) to form a colored complex, usually purple or violet, indicating a positive result.
Step 1: Understanding the structure of Tyrosine.
Tyrosine contains a phenolic group (-OH) attached to an aromatic ring (benzene ring). Thus, Tyrosine will give a positive neutral FeCl\(_3\) test.
Step 2: Understanding other options.
- Threonine, Cysteine, and Serine do not contain a phenolic group; they have hydroxyl groups attached to aliphatic chains, which will not react with FeCl\(_3\) to produce a positive result.
Step 3: Conclusion.
Therefore, Tyrosine is the only compound that will give a positive neutral FeCl\(_3\) test. Final Answer: Tyrosine.
Step 1: Understanding the structure of Tyrosine.
Tyrosine contains a phenolic group (-OH) attached to an aromatic ring (benzene ring). Thus, Tyrosine will give a positive neutral FeCl\(_3\) test.
Step 2: Understanding other options.
- Threonine, Cysteine, and Serine do not contain a phenolic group; they have hydroxyl groups attached to aliphatic chains, which will not react with FeCl\(_3\) to produce a positive result.
Step 3: Conclusion.
Therefore, Tyrosine is the only compound that will give a positive neutral FeCl\(_3\) test. Final Answer: Tyrosine.
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