Which one gives blue colour with iodine_______________?
Correct answer: A. Starch
- A. Starch
- B. Glycogen
- C. Cellulose
- D. Polysaccharide
Explanation
Iodine forms a blue to blue-black complex with the helical structure of amylose in starch. Students may choose glycogen because it is also a polysaccharide, but glycogen gives a reddish-brown colour with iodine rather than the characteristic blue colour of starch.
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About Carbohydrates
Carbohydrates are organic compounds classified as monosaccharides, disaccharides and polysaccharides according to their structure and hydrolysis products. The topic covers glycosidic bonds, glucose and fructose, sucrose, lactose and maltose, starch, glycogen and cellulose, along with their roles in energy storage, structural support and food tests.
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