The amino acid that gives a red-blood colour | vedclass

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(C) The sodium fusion test is used to detect elements like nitrogen, sulfur, and halogens in organic compounds.When an organic compound containing bot

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methionine

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(C) The sodium fusion test is used to detect elements like nitrogen, sulfur, and halogens in organic compounds.When an organic compound containing both nitrogen $(N)$ and sulfur $(S)$ is fused with sodium metal, sodium thiocyanate $(NaSCN)$ is formed.$Na + C + N + S \rightarrow NaSCN$When this extract is treated with sodium nitroprusside $(Na_2[Fe(CN)_5NO])$, the thiocyanate ion $(SCN^-)$ reacts to form a blood-red colored complex, ferric thiocyanate ($Fe(SCN)_3$ or $[Fe(SCN)(H_2O)_5]^{2+}$).Among the given amino acids, methionine is the only one that contains a sulfur atom in its structure.Therefore, methionine is the amino acid that will give a positive test for sulfur, resulting in a blood-red color.

The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is

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