Question

Which of the following does not show Mutarotation?
A.Glucose
B.Fructose
C.Maltose
D.Sucrose

Answer 1

Hint: As we are familiar with that fruit and vegetable has natural sugars like Glucose, Fructose, Maltose, Sucrose, etc. This sugar has some functional group, which is hydrogen carbon bonded. Aldehyde and Ketone's functional group shows some special phenomenon in sugar.

Complete step by step answer:
Firstly, Let's look at sugar
 Sugar-It is the sweet testing substance, which is generally found in foodstuff. It is divided into three categories: monosaccharides, Disaccharides, and Polysaccharides.
Monosaccharide- It is the group of the simplest form of sugar. It is also called simple sugar. It is water-soluble, colorless, and crystalline solid. Its formula is ${C_n}{H_{2n}}{O_n}$. Example- glucose, galactose, fructose.
Disaccharides-It is formed when two monosaccharides are joined by glycosidic linkage. It is also called double sugar. It is usually soluble in water.
Example- sucrose, lactose, maltose.
Polysaccharides-It is a long chain structure of monosaccharide and is bounded by glycosidic linkage. It is a complex chain of sugar. It reacts with water with the help of amylase enzymes.
Example-starch, glycogen, galactogen.
These sugars contain a functional group.
Mutarotation-It is the phenomenon of changes in optical rotations. It changes because of changes in the two anomers. It happens because of the free aldehyde and ketone group.
Here, Glucose, Maltose, and Fructose have free aldehyde and ketone groups. So, these shows mutarotation.
Sucrose does not have free aldehyde and ketone groups, so it does not show mutarotation.
Therefore, option D is the correct answer here.

Note:
 Glycosidic linkage- It is a kind of covalent bond which connects the sugar molecule to other groups. Amylase- It is a type of enzyme that helps in the hydrolysis of starch into sugar through catalyzes.
Anomers-When geometric variation is found in an atom of the carbohydrate molecule. It is called anomers.