Final answer:
Invert sugar is created when sucrose is hydrolyzed into its components, glucose and fructose. The student's question asking for the monosaccharide that pairs with glucose in invert sugar is correctly answered with fructose (A).
Step-by-step explanation:
Invert sugar is the result of sucrose undergoing hydrolysis, where it splits into its constituent monosaccharides. The correct answer to the student's question is A) Fructose. Sucrose is made up of one glucose molecule and one fructose molecule, and upon hydrolysis, these two monosaccharides are separated. Therefore, when invert sugar is formed, it contains equal amounts of glucose and fructose.
It is important to note that sucrose is a disaccharide that is efficiently broken down by the enzyme sucrase or invertase during the hydrolysis process. This reaction not only splits the molecule into glucose and fructose but also changes the optical rotation of the solution from dextrorotatory (+62.5°) to levorotatory (-19°), giving rise to the term 'invert sugar'.