E. Hydrolysis Of Disaccharides And Polysaccharides Sucrose , Sucrose HCStarch 1. Lodine Test 2. Menedict Test 3. Hydrolysis Yes/No) Questions And Problems Of Sun And
06 How Do The Results Of The Benedict's Test Indicate That Hydrolysis Of Sucrone Stareh Occurred?
07 How Do The Results Of The Iodine Test Indicate That Hydrolysis Of Starch Occurred
The Correct Answer and Explanation is :
drolysis of disaccharides like sucrose and polysaccharides such as starch can be monitored using Benedict’s and iodine tests, respectively. e tests help determine whether hydrolysis has occurred by indicating the presence or absence of specific carbohydrate structures.
nedict’s Test and Hydrolysis of Sucrose*
Benedt’s test detects reducing sugars, which have free aldehyde or ketone groups capable of reducing copper(II) ions in the reagent to copper(I) oxide, resulting in a color change from blue to green, yellow, orange, or red, depending on the amount of reducing sugar present. Sucros a non-reducing sugar because its glucose and fructose units are linked in a way that prevents the exposure of their reducing groups. Therefosucrose does not react with Benedict’s reagent. However, hydrolysis, sucrose is cleaved into its monosaccharide components, glucose and fructose, both of which are reducing sugars. When Benedi reagent is added to a hydrolyzed sucrose solution and heated, the presence of these reducing sugars will cause the solution to change color, indicating that hydrolysis has occurred. (en.wikipediorg)
Iodine Test and Hydrolysis of Starch iodine test is used to detect the presence of starch. Iodine molecules interact with the helical structure of amylose, aponent of starch, producing a deep blue-black color. When starch undergoes hydrolysis, it is broken down into smaller ohydrates, such as dextrins, maltose, and glucose. As hydrolysis progresses, the long helical structures of amylose are degraded, reducing tbility of iodine to form the blue-black complex. Consequently, the color intensity diminishes, transitioning to reddish-brown and eventually to yellow or colorles the starch is fully hydrolyzed into glucose. Therefore, a decrease or absence of the characteristic blue-black coloration upon adding iodinindicates that star drolysis has occurred. (chem.libretexts.org)
In summary, the Benedict’s test reveals the hydrolysis of sucrose by detecting the emergence of reducing sugars, evidenced by a color change upon heating with treagent. The iodine test indicates the hydrolysis of starch through the disappearance of the blue-black color, signifying the breakdown of starch into smaller carbohydrates that do not form the colored complex with iodine.