AIIMS 2019 Chemistry Carbohydrates MCQ Question

Starch is a polysaccharide composed of glucose units linked by α(1→4) and α(1→6) glycosidic bonds, and it forms a complex with iodine, resulting in a characteristic blue-black color. This reaction occurs because the iodine molecules fit into the helical structure of amylose, a component of starch, indicating the presence of starch in a sample. Options B, C, and D are irrelevant or incorrect because they do not accurately reflect the well-established chemical reaction between starch and iodine.