Question

Why is Glucose called grape sugar?

Answer 1

Glucose, commonly known as dextrose, is a kind of carbohydrate that belongs to the category of carbohydrates known as simple sugars (monosaccharides). ${C_6}{H_{12}}{O_6}$ is the chemical formula for glucose. It's present in fruits and honey, and it's the most common free sugar in higher animals' blood. It is the source of energy for cell activity, and its metabolism must be carefully regulated.

Complete solution:
Glucose is called grape sugar because it is found abundantly in fruits and most commonly in grapes.
Sugars make up a significant percentage of the soluble solid in grapes. The primary sugars in the juice are glucose and fructose. The sugar content of mature grape juice ranges from $150{\text{ }}to{\text{ }}250\dfrac{g}{L}$

Additional information:
Monosaccharides, oligosaccharides, and polysaccharides are the three types of carbohydrates.
Monosaccharides are the simplest kind of carbohydrate. Monosaccharides can be joined together by glycosidic linkages to produce oligosaccharides or polysaccharides, which are bigger carbohydrates. A disaccharide is an oligosaccharide containing just two monosaccharides. An oligosaccharide becomes a polysaccharide when more than 20 monosaccharides are joined with glycosidic linkages.
Thousands of monosaccharides may be found in certain polysaccharides, such as cellulose. A monosaccharide is a sort of monomer, or molecule, that can join together with other monomers to form a bigger polymer.
Some of the common monosaccharides are glucose, galactose, fructose etc,

Note:
Energy is required by every cell in the human body to carry out the metabolic activities that keep us alive. Glucose is a tiny, simple sugar that is used as a major source of energy for the brain, muscles, and a variety of other organs and tissues in the body. Glucose is also a component of the body's bigger structural molecules, such as glycoproteins and glycolipids. Glucose levels in the human body are closely controlled. Abnormally high or low levels might cause significant, perhaps fatal consequences.