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Which of the following statement is not true for glucose ? (1) Glucose exists in two crystalline forms α and β (2) Glucose gives Schiff's test for aldehyde (3) Glucose reacts with hydroxylamine to form oxime (4) The pentaacetate of glucose does not react with hydroxylamine to give oxime

1. (1) Glucose exists in two crystalline forms α and β
2. (2) Glucose gives Schiff's test for aldehyde
3. (3) Glucose reacts with hydroxylamine to form oxime
4. (4) The pentaacetate of glucose does not react with hydroxylamine to give oxime

Correct answer: (2) Glucose gives Schiff's test for aldehyde

Solution

Glucose is a sugar that exists predominantly in its cyclic form, which does not have a free aldehyde group in solution, thus it does not give a positive Schiff's test, which is specific for aldehydes.

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