Question

Which of the following statements is not true about glucose?

• A. It is an aldose.
• B. On heating with HI it forms n-hexane.
• C. It exists in furanose form.
• D. It does not give Schiff's test.

Hint:

Schiff's reagent tests for aldehydes, and glucose, being an aldose, will give a positive result.

Answer 1

The Correct Option is A

Step 1: Understanding glucose's properties. Glucose is an aldose (option A) and forms n-hexane on heating with HI (option B). It can exist in the furanose form (option C) as well.

 Step 2: Schiff's test. Glucose, being an aldehyde, will give a positive Schiff's test, which detects aldehydes. 

Step 3: Conclusion. Thus, the statement that glucose does not give Schiff's test is incorrect, corresponding to option (D). \vspace{10pt}