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Chapter 7: Problem 98

Which of the following carbohydrates undergo mutarotation? (a) Maltose (b) Sucrose (c) Cellulose (d) Fructose

Short Answer

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a) Maltose b) Sucrose c) Cellulose d) Fructose Answer: a) Maltose and d) Fructose

Step by step solution

01

Understanding Maltose

Maltose is a disaccharide composed of two glucose units linked by an α(1→4) bond. Both its individual units, glucose, can exist in the open-chain form (hemiacetal and hemiketal) and the cyclic form (pyranose and furanose). Thus, maltose can undergo mutarotation when its glucose units interconvert. Therefore, maltose undergoes mutarotation.
02

Understanding Sucrose

Sucrose is a disaccharide composed of one glucose unit and one fructose unit linked by an α(1→2) bond. This bond is quite stable and does not allow its units to exist in their open-chain forms. This locked anomeric configuration prevents sucrose from undergoing mutarotation. Therefore, sucrose does not undergo mutarotation.
03

Understanding Cellulose

Cellulose is a polysaccharide composed of glucose units linked together by β(1→4) bonds. Due to its linear and stable structure, it prevents the glucose units from existing in their open-chain forms and exchanging between conformations. Thus, cellulose does not undergo mutarotation.
04

Understanding Fructose

Fructose is a monosaccharide that can exist in open-chain form (hemiacetal and hemiketal) or in cyclic form (pyranose and furanose). Interconversion between these forms leads to mutarotation. Therefore, fructose undergoes mutarotation.
05

Conclusion

Among the given carbohydrates, maltose and fructose can undergo mutarotation, while sucrose and cellulose do not. So the answer is (a) Maltose and (d) Fructose.

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Most popular questions from this chapter

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.

State whether the following statements are true or false? (i) Glucose is the only aldose that shows mutarotation. (ii) The smallest aldose to form a hemiacetal is a tetrose. (iii) a-D-glucose \(\rightleftharpoons\) aldehyde form \(\rightleftharpoons\) b-D- glucose. This conversion is known as mutarotation. (iv) The anomers of D-glucose have specific rotations of same magnititude but opposite sign. (v) Sucrose is a 1,4 '-glycoside. (vi) In alkaline medium, fructose is a reducing sugar. (vii) Cellobiose is a polysaccharide. (viii) Natural sugar has D-configuration.

Which of the following statement is correct with respect to two epimeric hexoses? (a) \(\mathrm{C}-1\) and \(\mathrm{C}-2\) of both have the same configuration. (b) \(\mathrm{C}-3, \mathrm{C}-4\) and \(\mathrm{C}-5\) of both have the same configuration (c) \(\mathrm{C}-2, \mathrm{C}-3\) and \(\mathrm{C}-4\) of both have the same configuration (d) one of them must be an aldose and the other must be a ketose

Identify the correct statement(s) about thermoplastics from among the following (a) They can be remelted and remoulded many times by heating and cooling. (b) The intermolecular forces in thermoplastics are weaker than those present in elastomers. (c) There are no cross links between polymeric chain. (d) Neoprene is a thermoplastics polymer.

This section contains multiple choice questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONLY ONE is correct. An organic compound on elemental analysis is found to contain two chlorine atoms. This compound is treated with caustic soda and subsequently with \(\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right] \mathrm{OH}\) to get a silver deposit. Then we can say that (a) The two \(\mathrm{Cl}\) atoms are attached to an aromatic ring. (b) The two \(\mathrm{Cl}\) atoms are on adjacent carbons of an aliphatic chain. (c) The two \(\mathrm{Cl}\) atoms are on the same carbons of an aliphatic chain. (d) One chlorine is on a tertiary carbon atom.
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