Chemistry - Biomolecules Question with Solution | TestHub
Study of hydrolysis of surcrose, progress of this reaction is monitored with the help of polarimeter because a solution of sucrose is dextrorotatory and on hydrolysis, the mixture of products obtained becomes laevorotatory. That's why this reaction is also known as inversion of cane sugar.
Initially, a solution of 0.025 moles of sugar in 200 gm of water was taken. After 54 minutes the solution shows depresion in freezing point 0.372°C. (Kf(H2O) = 1.86 K kg mol-1)
The structures of the products obtained are:
Options:(select one or more)
Answer:
Solution:
These structures correctly represent the cyclic (Haworth) form of sugars with proper configuration of all chiral carbons.
The orientation of –OH groups and –CH₂OH group matches that of a D-sugar and the correct anomeric form is maintained.
In (A) and (D), the positions of –OH or –CH₂OH groups are wrongly placed, so their stereochemistry is incorrect.
Hence only B and C are correct products.