Which of the following gives a positive test with ninhydrin?

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Ninhydrin test:

Ninhydrin reacts with free -amino groups (–NH₂) to give a purple colour (Ruhemann's purple). It is used to detect amino acids and proteins.

| Compound | Contains -amino groups? | Ninhydrin test |
|---|---|---|
| Starch | No (polysaccharide) | Negative |
| Egg albumin | Yes (protein — contains amino acids with free –NH₂) | Positive ✓ |
| Polyvinyl chloride | No (synthetic polymer) | Negative |
| Cellulose | No (polysaccharide) | Negative |

Egg albumin is a protein (globular pro

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