Biomolecules · Chemistry · TS EAMCET

What is the IUPAC name of the product $Y$ in the given reaction sequence?

Two statements are given below :

I. Milk sugar is disaccharide of $\alpha$-D-galactose and $\beta$-D-glucose

II. Sucrose is disaccharide of $\alpha$-D-glucose and $\beta$-D-fructose