Sugar does not change to blue-black with iodine solution because it is a simple carbohydrate, not a polysaccharide. Iodine specifically reacts with starches, which have complex structures, while sugars have different molecular forms.
Sugar is an example of carbohydrates. Sugar is tested with iodine solution but it does not change to blue-black colour. What can be a possible reason?
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Sugar does not turn blue-black when tested with iodine solution because it is a simple carbohydrate, such as glucose or sucrose, rather than a polysaccharide. Iodine specifically reacts with starches, which are long chains of glucose molecules. The blue-black color change indicates the presence of starch, as iodine forms a complex with its helical structure. Simple sugars lack this structure, resulting in no color change. This difference highlights the variety of carbohydrates and their distinct chemical properties.
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