Question

Which among the following observations suggests that glucose also exists in cyclic form?

Options

• Hydroxylamine reacts with glucose to form glucose oxime.

• Acetylation of glucose obtains glucose pentaacetate.

• Glucose does not undergo condensation with 2, 4-dinitrophenylhydrazine.

• Prolong heating of glucose with HI yields n-hexane.

Answer 1

Glucose does not undergo condensation with 2, 4-dinitrophenylhydrazine.

Explanation:

The fact that glucose does not condense with 2, 4-dinitrophenylhydrazine indicates that it also exists in cyclic form.