Sucrose on breaking gives two molecules with same molecular formula but different structures: Glucose and fructose, where are both monosaccharide sugars.

Glucose is an aldehyde and whereas fructose is a ketone and has following structure according to Fischer projections.

Another difference is the number of chiral carbons in glucose is 4 whereas in fructose is 3. Also the number of 2° alcohol is 4 for glucose and 3 for fructose.

OR

Write the products obtained after hydrolysis of lactose.

Hydrolysis of lactose gives mixture of two compounds D-galactose and D-glucose. The reaction is as follows:

NOTE: the cyclic structures shown by Haworth projection are given as follows: