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Chapter 7: Problem 99

The wrong statement(s) among the following is/are (a) Glucose does not react with Grignard reagents. (b) Hydrolysis of maltose can be called inversion of sugar. (c) Amylopectin gives blue colour with iodine. (d) Ribose is an aldopentose.

Short Answer

Expert verified
The wrong statement among the given options is: (b) Hydrolysis of maltose can be called inversion of sugar.

Step by step solution

01

Option (a) Glucose does not react with Grignard reagents.

Glucose is an aldehyde (an aldohexose) that contains a carbonyl group (C=O), which can react with Grignard reagents. Grignard reagents are organometallic compounds (RMgX, where R is an alkyl or aryl group and X is a halogen), which can act as strong nucleophiles and form carbon-carbon bonds. However, glucose is protected due to the presence of its hemiacetal structure, which prevents it from reacting with Grignard reagents. Therefore, this statement is correct.
02

Option (b) Hydrolysis of maltose can be called inversion of sugar.

Inversion of sugar refers to the process by which sucrose, a disaccharide, is hydrolyzed to form an equimolar mixture of glucose and fructose, which are monosaccharides. Maltose, on the other hand, is another type of disaccharide that is composed of two glucose units. When maltose is hydrolyzed, it produces two glucose molecules, not an equimolar mixture of glucose and fructose. Thus, the hydrolysis of maltose cannot be called inversion of sugar. This statement is incorrect.
03

Option (c) Amylopectin gives blue color with iodine.

Amylopectin is a branched polymer of glucose and is a major component of starch. When amylopectin is treated with iodine, the helical structure of amylopectin traps the iodine molecules, and the complex formed absorbs light in the visible region, resulting in the appearance of a blue color. This is a well-known characteristic reaction of amylopectin. Hence, this statement is correct.
04

Option (d) Ribose is an aldopentose.

Ribose is a monosaccharide with a molecular formula of C5H10O5, which means it contains five carbon atoms in its structure. An aldopentose is a monosaccharide containing five carbons, one of which is an aldehyde. Ribose has an aldehyde functional group in its structure, making it an aldopentose. Thus, this statement is correct. Conclusion: Among the given statements, option (b) is incorrect.

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