Question

Which of the following statement is correct for glucose?

• A. It gives positive test with Schiff's reagent
• B. It forms addition product with $NaHS{O}_3$
• C. Pentaacetate derivative of glucose does not react with $H_{2}N-OH$
• D. On prolonged heating with $HI$, glucose gives cyclopentane

Answer 1

The correct option is C Pentaacetate derivative of glucose does not react with $H_{2}N-OH$

Despite having the aldehyde group, glucose does not react with Schiff's reagent and it does not form the hydrogensulphite addition product with $NaHS{O}_3$.
The pentaacetate derivative of glucose does not react with hydroxylamine indicating absence of free $-CHO$ group.
On prolonged heating with $HI$, glucose gives n-hexane suggesting that all six carbon atoms are linked in a straight chain.