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प्रश्न
Write the reaction involved when D-glucose is treated with the following reagent:
(CH3CO)2O
Write the reaction when D-glucose reacts with the following:
Acetic anhydride
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उत्तर
\[\begin{array}{cc}
\phantom{.}\ce{CHO}\phantom{........................................}\ce{CHO}\phantom{...................}\\
|\phantom{...............................................}|\phantom{......................}\\
\phantom{.....................}\ce{(CHOH)4 + \underset{Acetic anhydride}{5(CH3CO)2O}->(CHOCOCH3)4 + 5CH3COOH}\\
|\phantom{...............................................}|\phantom{......................}\\
\phantom{...}\ce{\underset{\text{D-glucose}}{CH2OH}}\phantom{...................................}\ce{CH2O-C-CH3}\phantom{....}\\
\phantom{..................................................}||\\
\phantom{..................................................}\ce{\underset{\text{Glucose penta acetate}}{O}}
\end{array}\]
संबंधित प्रश्न
The following compound can be called as:
When glucose reacts with bromine water, the main product is ____________.
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.
The reaction of glucose with red P + HI is called ____________.
The number of chiral carbons in ß-D(+) glucose is ____________.
Three structures are given below in which two glucose units are linked. Which of these linkages between glucose units are between C1 and C4 and which linkages are between C1 and C6?
| (I) |  |
| (II) |  |
| (III) |  |
On the basis of which evidences D-glucose was assigned the following structure?
\[\begin{array}{cc}
\ce{CHO}\\
|\phantom{....}\\
\phantom{..}\ce{(CHOH)4}\\
|\phantom{....}\\
\phantom{..}\ce{CH2OH}
\end{array}\]
Account for the following:
What happens when D – glucose is treated with the following reagents
HNO3
Give a reason for the following observations:
Penta-acetate of glucose does not react with hydroxylamine.
