When you dissolve sucrose in water does it fall apart into g

When you dissolve sucrose in water, does it fall apart into glucose and fructose or does it remain as a disaccharide? Explain.

Solution

Sucrose is a non-reducing disaccharide with a molecular formula: C12H22O11

Sucrose is made up of GLUCOSE and FRUCTOSE linked together through anomeric carbons (a carbon derived from the carbonyl carbon i.e. aldehyde or ketone).

Sucrose is a polar molecule due to presence of hydrogen bonds in its structure, due to which it forms molecular solutions with water.

when sucrose is added to water, a hydrogen bond interchange occurs wherein the hydrogen bonds between the hydroxyl group of sugar (intra-molecular hydrogen bonds) are broken down and new hydrogen bonds are formed between the water molecule and the sucrose (inter-molecular H-bonding occurs), resulting in the hydration of sucrose molecule. The solubility between sucrose and water increases with increase in temperature, because high temperature breaks the water-water H bonds and sucrose-sucrose H-bonds and leaves both entities free to bond with each other.

Thus, each molecule of sucrose is now hydrated or surrounded by the water molecules due to hydrogen bonding.

Hence, there is no change in the chemistry of sucrose, i.e. sucrose is NOT converted into its monomers (glucose and fructose). sucrose remains as a disaccharide.