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प्रश्न
Which of the following reactions of glucose can be explained only by its cyclic structure?
पर्याय
Glucose forms pentaacetate
Glucose reacts with hydroxylamine to form an oxime
Pentaacetate of glucose does not react with hydroxylamine
Glucose is oxidised by nitric acid to gluconic acid
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उत्तर
Pentaacetate of glucose does not react with hydroxylamine
Explanation:
The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free –CHO group. This property of glucose can be explained only by its cyclic structure.
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संबंधित प्रश्न
Enlist the properties of glucose that can not be explained on the basis of open chain structure of it
Differentiable between the following:
Amylose and Amylopectin
Answer the following question.
What is the basic structural difference between glucose and fructose?
The following compound can be called as:
Choose the appropriate answer(s) for the below representation from the options given
Which of the following properties of glucose cannot be explained by its open chain structure?
(i) Glucose does not form hydrogen sulphite with NaHSO3.
(ii) On oxidation with HNO3 glucose gives saccharic acid.
(iii) Glucose is found to exist in two different crystalline forms which are named as α and β.
Glucose is found to exist in two different α and β crystalline forms. These forms can be obtained by:
(i) The α form of glucose is obtained by crystallisation from a concentrated solution of glucose at 303 K.
(ii) The β form of glucose is obtained by crystallisation from a concentrated solution of glucose at 303 K.
(iii) The β form is obtained by crystallisation from hot and saturated aqueous solution at 371 K.
(iv) The α form is obtained by crystallisation from hot and saturated aqueous solution at 371 K.
Reduction of glucose by HI suggest that ____________.
A solution of D-glucose in water rotates the plane polarised light ____________.
The letter D and L in carbohydrates represent ____________.
The number of chiral carbons in ß-D(+) glucose is ____________.
In the following reaction, identify A and B:
\[\begin{array}{cc}
\ce{C6H12O6 ->[Acetic anhydride] A}\\
\downarrow \text{Conc. nitric acid}\phantom{...}\\
\ce{B}\phantom{.................}\end{array}\]
Write the reactions of D-glucose which can’t be explained by its open-chain structure. How can cyclic structure of glucose explain these reactions?
On the basis of which evidences D-glucose was assigned the following structure?
\[\begin{array}{cc}
\ce{CHO}\\
|\phantom{....}\\
\phantom{..}\ce{(CHOH)4}\\
|\phantom{....}\\
\phantom{..}\ce{CH2OH}
\end{array}\]
What happens when D-glucose is treated with the following reagent?
HI
Account for the following:
What happens when D – glucose is treated with the following reagents
Bromine water
Match List - I with List - II.
| List I | List II | ||
| (A) | Glucose + HI | (I) | Gluconic acid |
| (B) | Glucose + Br2 water | (II) | Glucose pentacetate |
| (C) | Glucose + acetic anhydride | (III) | Saccharic acid |
| (D) | Glucose + HNO3 | (IV) | Hexane |
Choose the correct answer from the options given below:
When D-glucose reacts with HI, it forms ______.
Give the reaction of glucose with hydrogen cyanide. Presence of which group is confirmed by this reaction?
Give a reason for the following observations:
Penta-acetate of glucose does not react with hydroxylamine.
