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प्रश्न
Describe laboratory method for preparation of glucose.
Explain preparation of glucose from sugar cane.
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उत्तर
Preparation of glucose
Glucose can be prepared in the laboratory by boiling sucrose (cane sugar) with dilute hydrochloric acid or sulphuric acid for about two hours. This hydrolyzes sucrose to glucose and fructose. In order to separate glucose from fructose, alcohol is added during cooling. Glucose is almost insoluble in alcohol. It crystallizes out first, while fructose is more soluble. It remains in the solution. The solution is filtered to obtain the crystals of glucose.
By boiling sucrose with dilute HCl or H2SO4 in alcoholic solution
`C_12H_22O_11+H_2O H^+/""> C_6H_12O_6+C_6H_12O_6`
Sucrose Glucose Fructose
By boiling starch with dilute H2SO4, at 393 K, under pressure
`(C_6H_10O_5)_n+nH_2OH^+/"393k,2-3 atoms">nC_6H_12O_6`
starch or cellulose Glucose
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संबंधित प्रश्न
What is the action of following reagents on glucose?
bromine water
A 10% solution (by mass) of sucrose in water has freezing point of 269.15 K. Calculate the freezing point of 10% glucose in water, if freezing point of pure water is 273.15 K
Given : (Molar mass of sucrose = 342 g mol−1)
(Molar mass of glucose = 180 g mol−1)
How is glucose prepared from cane sugar (sucrose)?
Which component of starch is a branched polymer of α-glucose and insoluble in water?
How is glucose prepared by commercial method? How is peptide linkage formed?
How is glucose prepared from starch?
Hydrolysis of starch yields ____________.
Which among the following is the simplest sugar?
Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives ______.
Carbohydrates are classified on the basis of their behaviour on hydrolysis and also as reducing or non-reducing sugar. Sucrose is a:
(i) monosaccharide
(ii) disaccharide
(iii) reducing sugar
(iv) non-reducing sugar
How do you explain the presence of all the six carbon atoms in glucose in a straight chain?
In nucleoside a base is attached at 1′ position of sugar moiety. Nucleotide is formed by linking of phosphoric acid unit to the sugar unit of nucleoside. At which position of sugar unit is the phosphoric acid linked in a nucleoside to give a nucleotide?
Which sugar is called invert sugar? Why is it called so?
During curdling of milk, what happens to sugar present in it?
How do you explain the presence of five – OH groups in glucose molecule?
How do you explain the presence of an aldehydic group in a glucose molecule?
The α-D glucose and β-D glucose differ from each other due to difference in carbon atom with respect to its
A nucleoside is made of:-
Which of the following base is not present in RNA?
Among the naturally occuring carbohydrates, furanose ring is found in the:
Which of the following statements is not true about glucose?
How is glucose prepared on commercial scale?
