Question
Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques
A disaccharide X cannot be oxidised by bromine water. The acid hydrolysis of X leads to a laevorotatory solution. The disaccharide X is
Solution
Sucrose is a non-reducing disaccharide composed of glucose and fructose units joined together by a glycosidic bond. It cannot be oxidized by bromine water because it does not have a reducing group (such as an aldehyde or a ketone) that can be oxidized.
When sucrose undergoes acid hydrolysis, it breaks down into its constituent monosaccharides, glucose, and fructose. This hydrolysis reaction occurs due to the cleavage of the glycosidic bond. The resulting mixture of glucose and fructose is known as invert sugar and it is laevorotatory, meaning it rotates plane-polarized light to the left.
Therefore, the disaccharide X is most likely sucrose.