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  4. The α -amino acid which does not give purple colour in the ninhydrin test is

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Q. The $\alpha$ -amino acid which does not give purple colour in the ninhydrin test is

Chhattisgarh PMTChhattisgarh PMT 2011

Solution:

Ninhydrin test is highly specific for primary amines. Proline being a secondary amine give a yellow orange colour with Ninhydrin whereas all other a-amino acids give a blue-purple colour with ninhydrine.