Which of the following carbohydrates is not a disaccharide?a)Lactoseb)Maltosec)Sucrosed)GalactoseCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Galactose is a monosaccharide. When combined with glucose (monosaccharide), through a condensation reaction, the result is the disaccharide lactose. The hydrolysis of lactose to glucose and galactose is catalyzed by the enzymes lactase and β-galactosidase.
Chemical formula: C₆H₁₂O₆
Solubility in water: 650 g/L (20 °C)

Answer

Galactose is a monosaccharide and has the same chemical formula as glucose, i.e., C6H12O6

Answer

Yes the correct answer is Option D because
Lactose contains Glucose and Galactose so it is a disaccharide.
Maltose contains Glucose and Glucose so it is also a disaccharide.
Sucrose contains Glucose and Fructose so it is also a disaccharide.
While the Galactose is a monosacharide.

Answer

< b='' />Explanation: < />

Disaccharides are carbohydrates composed of two monosaccharide units joined together by a glycosidic bond. Lactose, maltose, and sucrose are all examples of disaccharides. However, galactose is not a disaccharide; it is a monosaccharide.

< b='' />Monosaccharides: < />

Monosaccharides are the simplest form of carbohydrates, consisting of a single sugar unit. They are classified based on the number of carbon atoms they contain, such as triose (3 carbon atoms), tetrose (4 carbon atoms), pentose (5 carbon atoms), and hexose (6 carbon atoms). Galactose is a hexose monosaccharide.

< b='' />Disaccharides: < />

Disaccharides are formed when two monosaccharides undergo a condensation reaction, resulting in the formation of a glycosidic bond between the two sugar units. The most common disaccharides are lactose, maltose, and sucrose.

< b='' />Lactose: < />

Lactose is a disaccharide composed of one molecule of glucose and one molecule of galactose. It is commonly found in milk and dairy products.

< b='' />Maltose: < />

Maltose is a disaccharide composed of two glucose molecules joined together. It is commonly found in germinating grains and is produced during the digestion of starch.

< b='' />Sucrose: < />

Sucrose is a disaccharide composed of one molecule of glucose and one molecule of fructose. It is commonly known as table sugar and is found in fruits, vegetables, and sugarcane.

< b='' />Galactose: < />

Galactose, on the other hand, is a monosaccharide and not a disaccharide. It is a C-4 epimer of glucose, meaning that the only difference between galactose and glucose is the configuration around the fourth carbon atom. Galactose is less commonly found in free form and is usually found as a component of lactose.

Therefore, the correct answer is option D, 'Galactose,' as it is not a disaccharide but a monosaccharide.

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