Question

Since both glucose and starch are types of carbohydrate, why could you get different reactions for the Iodine and Benedict’s test?

A) Glucose and starch have different chemical structures.
B) Glucose and starch have different solubilities in water.
C) Glucose and starch have different reducing properties.
D) Glucose and starch have different pH levels.
E) Glucose and starch have different molecular weights.

Answer 1

The correct answer is option A) Glucose and starch have different chemical structures, which lead to different reactions in the iodine and Benedict's test.

Step-by-step explanation:

The reason why you can get different reactions for the iodine and Benedict’s test when testing for glucose and starch is because option A) glucose and starch have different chemical structures. Starch is composed of two polymers, amylose and amylopectin, while glucose is a monosaccharide. When iodine contacts starch, it forms an amylose-iodine complex, resulting in a blue-violet color. On the other hand, Benedict's solution tests for reducing sugars, such as glucose, through a redox reaction.