Home
Class 12
CHEMISTRY
Which of the following statements is not...

Which of the following statements is not true about glucose?

A

It does not give `NaHSO_(3)`

B

It is present in furanose form

C

On reaction with `Br_(2)` water it forms gluconic acid

D

It is a reducing sugar

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement is not true about glucose, we need to analyze each statement provided in the context of glucose's structure and properties. Here’s a step-by-step breakdown: ### Step 1: Understand the Structure of Glucose Glucose is a six-carbon sugar (hexose) that can exist in two forms: an open-chain form and a cyclic form. The cyclic form is more prevalent in solution and can exist as a six-membered ring (pyranose) or a five-membered ring (furanose). ### Step 2: Identify the Forms of Glucose - The cyclic form of glucose is known as pyranose, which consists of six members (five carbons and one oxygen). - The furanose form is a five-membered ring and is typically associated with fructose, not glucose. ### Step 3: Analyze the Statements 1. **Statement about NHSO3 Reaction**: Glucose does not react with sodium bisulfite (NHSO3) because it does not have a free aldehyde group in its cyclic form. This statement is true. 2. **Statement about Furanose Form**: Glucose primarily exists in the pyranose form, not furanose. This statement is false and is the answer we are looking for. 3. **Statement about Reaction with Bromine Water**: Glucose reacts with bromine water to form gluconic acid, confirming it has a reducing property. This statement is true. 4. **Statement about Reducing Sugar**: Glucose is classified as a reducing sugar because it has a free aldehyde group when in solution. This statement is also true. ### Conclusion The statement that is not true about glucose is that it is present in furanose form. Glucose primarily exists in the pyranose form. ### Final Answer **The statement that is not true about glucose is: "It is present in furanose form."** ---

To determine which statement is not true about glucose, we need to analyze each statement provided in the context of glucose's structure and properties. Here’s a step-by-step breakdown: ### Step 1: Understand the Structure of Glucose Glucose is a six-carbon sugar (hexose) that can exist in two forms: an open-chain form and a cyclic form. The cyclic form is more prevalent in solution and can exist as a six-membered ring (pyranose) or a five-membered ring (furanose). ### Step 2: Identify the Forms of Glucose - The cyclic form of glucose is known as pyranose, which consists of six members (five carbons and one oxygen). - The furanose form is a five-membered ring and is typically associated with fructose, not glucose. ...
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • SAMPLE PAPER 02

    EDUCART PUBLICATION|Exercise SECTION - B|24 Videos
  • SAMPLE PAPER 02

    EDUCART PUBLICATION|Exercise SECTION - C|6 Videos
  • SAMPLE PAPER 01

    EDUCART PUBLICATION|Exercise SECTION-C|5 Videos
  • SAMPLE PAPER 04

    EDUCART PUBLICATION|Exercise SECTION C|6 Videos