S-I : D – Glucose and D – Galactose are C – 4 epimers
S-II : $\mathrm{\alpha }-\mathrm{D}$ fructose and $\mathrm{\beta }-\mathrm{D}$ fructose are C-2 anomers

Differ in configuration of forth carbon. Hence they of ${\mathrm{C}}_4$– epimers

Differs in conjugation of second carbon which is ${\mathrm{C}}_2$ anomers