Will iodine react with sucrose or glucose? I would say no, because it reacts with starch, a polysaccharide, and glucose is a monosaccaride and sucrose is a combination of fructose and glucose, two monosaccharides. Am I right? Why or why not? How does iodine cause a reaction to starch? Thanks!
For the first part of your post, try some of the following links:
h t t p://s e a r c h.y a h oo .c o m/s e a r c h ? f r = mc a f e e &p = W i l l + i o d i n e + r e a c t + w i t h + s u c r o s e + o r + g l u c o s e % 3 F
Sra
Sra - PLEASE DO NOT REPLY WITH WEBSITES!!! (This one didn't even work :-P). People then do not give legitimate answers because they think the question has already been answered. In addition, I only post on here when I have exhausted the Internet searching for answers to my questions. There is a good reason why this site tries to stop a person from giving a web site as an answer - PLEASE DON'T BYPASS THIS BY DISGUISING YOUR LINK!!! Now I will have to repost and again ask for help - I hope someone who understands the material can help me.
You are partially correct. Iodine does not react with sucrose or glucose, as they are both simple sugars or monosaccharides. However, iodine does react with starch, a polysaccharide.
The reaction between iodine and starch is primarily due to the structure of starch molecules. Starch consists of long chains of glucose molecules linked together. These chains coil up to form a compact structure. When iodine comes in contact with starch, it gets trapped within these coiled structures, forming a blue-black color complex. This reaction is known as the iodine-starch reaction.
The iodine-starch reaction occurs because iodine molecules fit snugly into the helical structure of starch, forming a stable complex. In contrast, simple sugars like glucose and sucrose do not have the same helical structure, so iodine molecules cannot penetrate and react with them.
In summary, iodine does not react with sucrose or glucose because they are monosaccharides, but it does react with starch due to its helical structure, causing the formation of a blue-black color complex.
Yes, you are correct. Iodine does not react with sucrose or glucose. The reason for this lies in the chemical structure of these compounds.
Sucrose, also known as table sugar, is a disaccharide composed of fructose and glucose molecules. Since iodine reacts with starch - a polysaccharide made up of many glucose units - it does not have the same reaction with individual glucose molecules or even combinations of glucose molecules like sucrose.
Starch, consisting of two types of polysaccharides called amylose and amylopectin, has a specific arrangement of glucose units that allows iodine to form a complex with its structure. This complex between iodine and starch causes a color change from yellow-brown to blue-black, indicating the presence of starch.
The reaction between iodine and starch occurs due to the formation of helical structures in the starch molecule. The helical structure has spaces that allow iodine molecules to penetrate and form a complex resulting in the color change.
To witness this reaction, you can perform a simple experiment by adding a drop of iodine solution to a sample that contains starch, like a potato, rice, or bread. The area of the sample where starch is present will turn blue-black in color.
I hope this explanation helps! If you have any further questions, feel free to ask.