Which one of the following reactions of glucose can be explained only by its cyclic structure?
| 1. | Glucose forms pentaacetate. |
| 2. | Glucose reacts with hydroxylamine to form an oxime. |
| 3. | Pentaacetate of glucose does not react with hydroxylamine. |
| 4. | Glucose is oxidized by nitric acid to saccharic acid. |
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