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JEE Main Chemistry question

ChemistryBiomoleculesJEE Main

Consider the following amino acids: (i) Leucine (ii) Proline (iii) Tryptophan (iv) Tyrosine (v) Cysteine (vi) Histidine. How many of the above will give a positive result with either Millon's test or the Nitroprusside test?

Answer: 2

Solution

Millon's test is positive for amino acids bearing a phenolic group, which is satisfied by tyrosine; the Nitroprusside test is positive for amino acids bearing a free thiol () group, which is

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Question ID VK-151256