☰
Biomolecules
The following reactions cannot be explained by its open chain structure:
(i) Despite having an aldehydic group, glucose does not give Schiff’s test and it does not react with sodium bisulphite and ammonia.
(ii) The penta-acetate of glucose does not react with hydroxylamine indicating absence of —CHO group.
(iii) Mutarotation: When glucose is crystallized from a concentrated solution at 30°C, it gives a form of glucose m.p. 146°C, [α]D = (+) 111°, on the other hand the β-form (m.p. 15°C), [α]D = (+) 19.2° is obtained on crystallization of glucose from a hot saturated aqueous solution at a temperature above 98°C. This behaviour cannot be explained by its open chain structure.
Sponsor Area
What are the expected products of hydrolysed of lactose?
How do you explain the absence of aldehyde group in the penta acetate of D-glucose?
The melting points and solubility of water of amino acids are generally higher than that of the corresponding halo acids. Explain.
Where does the water present in the egg go after the boiling the egg?
What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?
When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA?
Sponsor Area
Sponsor Area