Question:
Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?
Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?
Updated On: Apr 12, 2026
- Threonine
- Serine
- Tyrosine
- Cysteine
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
The neutral Ferric Chloride ($FeCl_3$) test is a specific qualitative test for phenols. A violet or purple complex indicates a phenolic hydroxyl group.
Step 2: Detailed Explanation:
1. Tyrosine contains a \textit{p}-hydroxyphenyl side chain (a phenol group). Thus, it reacts with $FeCl_3$.
2. Serine and Threonine contain aliphatic hydroxyl ($-OH$) groups, which do not give this test.
3. Cysteine contains a thiol ($-SH$) group.
Step 3: Final Answer:
The amino acid is Tyrosine.
The neutral Ferric Chloride ($FeCl_3$) test is a specific qualitative test for phenols. A violet or purple complex indicates a phenolic hydroxyl group.
Step 2: Detailed Explanation:
1. Tyrosine contains a \textit{p}-hydroxyphenyl side chain (a phenol group). Thus, it reacts with $FeCl_3$.
2. Serine and Threonine contain aliphatic hydroxyl ($-OH$) groups, which do not give this test.
3. Cysteine contains a thiol ($-SH$) group.
Step 3: Final Answer:
The amino acid is Tyrosine.
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