Question:
Statement-I : Despite having aldehyde group, glucose does not give Schiff test.
Statement-II : Glucose exists in \(\alpha\) and \(\beta\) crystalline forms.
Statement-I : Despite having aldehyde group, glucose does not give Schiff test.
Statement-II : Glucose exists in \(\alpha\) and \(\beta\) crystalline forms.
Statement-II : Glucose exists in \(\alpha\) and \(\beta\) crystalline forms.
Show Hint
Glucose mainly exists in cyclic hemiacetal forms (\(\alpha\)- and \(\beta\)-glucose). Because the free aldehyde form is present only in a very small amount, glucose does not give Schiff's test even though it is a reducing sugar.
Updated On: Jun 26, 2026
- Both statements I and II are incorrect
- Both statements I and II are correct
- Statement I is correct but statement II is incorrect
- Statement I is incorrect but statement II is correct
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Examine Statement-I.
Glucose contains an aldehyde group in its open-chain structure.
However, in aqueous solution and in crystalline form, glucose predominantly exists in cyclic hemiacetal forms rather than in the open-chain aldehyde form.
The concentration of the free aldehyde form is extremely small.
Therefore, glucose does not give Schiff's test, although it can reduce Fehling's solution and Tollens' reagent due to equilibrium with the open-chain form.
Hence, Statement-I is correct.
Step 2: Examine Statement-II.
Glucose exists in two cyclic crystalline forms known as: \[ \alpha\text{-D-glucose} \] and \[ \beta\text{-D-glucose} \] These two forms differ in the configuration of the hydroxyl group attached to the anomeric carbon (\(C_1\)).
They are called anomers and interconvert in solution through mutarotation.
Hence, Statement-II is also correct.
Step 3: Final conclusion.
Both statements are correct: \[ \boxed{\text{Statement-I is correct}} \] and \[ \boxed{\text{Statement-II is correct}} \] Therefore, \[ \boxed{\text{Both statements I and II are correct}} \] Hence, the correct option is \[ \boxed{(2)} \]
Glucose contains an aldehyde group in its open-chain structure.
However, in aqueous solution and in crystalline form, glucose predominantly exists in cyclic hemiacetal forms rather than in the open-chain aldehyde form.
The concentration of the free aldehyde form is extremely small.
Therefore, glucose does not give Schiff's test, although it can reduce Fehling's solution and Tollens' reagent due to equilibrium with the open-chain form.
Hence, Statement-I is correct.
Step 2: Examine Statement-II.
Glucose exists in two cyclic crystalline forms known as: \[ \alpha\text{-D-glucose} \] and \[ \beta\text{-D-glucose} \] These two forms differ in the configuration of the hydroxyl group attached to the anomeric carbon (\(C_1\)).
They are called anomers and interconvert in solution through mutarotation.
Hence, Statement-II is also correct.
Step 3: Final conclusion.
Both statements are correct: \[ \boxed{\text{Statement-I is correct}} \] and \[ \boxed{\text{Statement-II is correct}} \] Therefore, \[ \boxed{\text{Both statements I and II are correct}} \] Hence, the correct option is \[ \boxed{(2)} \]
Was this answer helpful?
0
0
Top AP EAPCET Chemistry Questions
- The four quantum numbers of the valence electron of potassium are :
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
- In which of the following the election gain enthalpy of elements is correctly arranged?
- The radii of $ \text{F,}{{\text{F}}^{-}}\text{O} $ and $ {{\text{O}}^{2-}} $ are in the order
- Which of the following has the highest first ionization potential?
View More Questions
Top AP EAPCET Carbohydrates Questions
- When glucose is oxidized with nitric acid, the compound formed is
- Which of the following represents α-D-fructofuranose?
- Which of the following conversions indicate the presence of –CH\(_2\)OH group in glucose?
- Carbohydrates are stored in plants and animals in which of the following forms respectively?
- Which of the following is a non-reducing sugar?
View More Questions
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions