Reduction of `D`-glucose forms `D`-sorbitol while that of `D`-fructose forms a mixture of `D`-sorbitol and `D`-mannitol.

Answer

Due to the difference in configuration
`(##RES_ORG_CHM_V02_XII_C04_E01_259_A01##)`
Dotted system of both have same configuration `gt C =0` on reduction in the fructose gives two different configuration at `C_(2)`.