Question

Which of the following statement is not true for glucose?

• A. The pontaacetate of glucose does not react with hydroxylamine to give oxime.
• B. Glucose reacts with hydroxylamine to form oxime.
• C. Glucose gives Schiff's test for aldehyde.
• D. Glucose exists in two crystalline forms $\alpha$ and $\beta$.

Answer 1

Answer: (C)

Glucose gives Schiff's test for aldehyde.

Answer 2

Glucose does not give Schiff's test for aldehyde because it is not a free aldehyde. Instead, it reacts with Schiff's reagent (potassium metabisulfite and fuchsin) to give a negative result.

So, the correct option is (C): Glucose gives Schiff's test for aldehyde.