The specific rotation of a freshly prepared aqueous solution of -D-glucose changes from an initial value of x^ to a constant equilibrium value of y^ due to mutarotation. The values of x and y are respectively:

Step-by-step solution

The specific rotation of pure -D-glucose is +112^ . When dissolved in water, it undergoes mutarotation to form an equilibrium mixture of and anomers. The specific rotation of the equilibrium mixture is +52.5^ . Thus, the initial value x is 112^ and the equilibrium value y is 52.5^ . Answer: 112^ and 52.5^