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Question

Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?

Options

A.Threonine
B.Serine
C.Tyrosine
D.Cysteine

Solution

Sol. [Key Concept: Tyrosine carries a phenolic $- OH$ group, which gives the characteristic violet-coloured complex with neutral ${FeCl}_{3}$ solution.]

Tyrosine amino acid will give violet coloured complex with neutral ${FeCl}_{3}$ solution because it contains phenolilc group.

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