Fructose and glucose are
A. allotropes of each other.
B. both disaccharides.
C. dimers of each other.
D. isomers of each other.
E. isotopes of each other.
The correct answer is D. isomers of each other.
Explanation: Fructose and glucose are isomers of each other, which means they have the same molecular formula, but different structural arrangements of atoms. In this case, both fructose and glucose have the molecular formula
C6H12O6, but their atoms are arranged differently in their respective molecules as shown below:
Take note of the other terms in the given options to understand why they are not correct.
Allotropes are different forms of the same element in the same physical state (solid, liquid, gas, or coloured) with different bonding arrangements or molecular structures. For example, graphite and diamond are allotropes of carbon. White, red and black phosphorus are allotropes of phosphorus.
Disaccharides are carbohydrates made up of two monosaccharide (simple sugar) units joined together. Both fructose and glucose are monosaccharides, not disaccharides. An example of a disaccharide would be sucrose, which is composed of one glucose and one fructose molecule joined together.
Dimere is not a term used in chemistry. However, the term dimer refers to a compound formed by the combination of two identical or similar molecules. Fructose and glucose are not dimers of each other.
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. Fructose and glucose are molecules, not atoms, so they cannot be isotopes of each other.
In conclusion, fructose and glucose are isomers of each other, as they have the same molecular formula but different structural arrangements of atoms.
SOURCE: NECO CHEMISTRY 2001 QUESTION 20
0 Comments