Question

Given are 4 statements related to the chemical properties of Glucose. Identify the two incorrect statements from the following.

• A. It reacts with \( \text{Br}_2 \) (aq) to form Saccharic acid.
• B. Reacts with Acetic anhydride to form Glucose tetraacetate.
• C. Reacts with Hydroxylamine to give Glucose oxime.
• D. It reacts with ammoniacal \( \text{AgNO}_3 \) to form ammonium salt of Gluconic acid with deposition of silver.

Hint:

When studying reactions of glucose, remember that it is a reducing sugar and it can react with various reagents like \( \text{Br}_2 \), acetic anhydride, and hydroxylamine to form characteristic products.

Answer 1

The Correct Option is A

Let's evaluate the given statements about the chemical properties of Glucose:
Statement A:
"It reacts with \( \text{Br}_2 \) (aq) to form Saccharic acid." This statement is incorrect. Glucose does not react with bromine water to form Saccharic acid. Instead, glucose reacts with bromine water to form gluconic acid, not saccharic acid.
Statement B:
"Reacts with Acetic anhydride to form Glucose tetraacetate." This statement is correct. Glucose can react with acetic anhydride to form glucose tetraacetate, a common esterification reaction involving glucose.
Statement C:
"Reacts with Hydroxylamine to give Glucose oxime." This statement is correct. Hydroxylamine reacts with aldehydes like glucose to form oximes.
Statement D:
"It reacts with ammoniacal \( \text{AgNO}_3 \) to form ammonium salt of Gluconic acid with deposition of silver." This statement is correct. Glucose, being an aldose, reduces \( \text{AgNO}_3 \) in ammoniacal solution (Tollens' test) and forms a silver mirror, while also forming gluconic acid. Thus, the two incorrect statements are A and B, so the correct answer is \( \text{A} \).