Proteins when heated with $c o n c . H N O_{3}$ give a yellow colour. This is:

Oxidising test

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Xanthoprotic test

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Hopper's test

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Acid-base test

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Solution

The correct option is B Xanthoprotic test
Xanthoprotic test is given by a protein which consists of a-amino acids containing a benzene ring such as tyrosine, phenylalanine etc. This yellow colour is due to nitration of benzene ring.
$P r o t e i n + C o n c . H N O_{3} \to Y e l l o w c o l o u r$

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