Which of the following amino acid(s) gives positive test with ceric ammonium nitrate?

Threonine

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Proline

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Serine

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Valine

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Solution

The correct option is C Serine
Amino acids which have alcohol group will give positive test with ceric ammonium nitrate.
The appearance of red colour solution on treatment of amino acids with ceric ammonium nitrate indicate the presence of $O H$ group in amino acid.
Threonine and Serine has $O H$ group so it gives positive test with ceric ammonium nitrate.

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