Domanda n. 7c641
Risposta:
D-Galactose is a dextrorotatory compound.
Spiegazione:
D-galactose exists almost completely in two cyclic forms.
The specific rotation of α-D-galactose is +150.7°, and that of β-D-galactose is +52.8°.
When an aqueous solution of the two forms is allowed to equilibrate, the specific rotation is +80.2°.
Similarly, the specific rotation of α-L-galactose is -150.7°, and that of β-L-galactose
is -52.8°.
The specific rotation of an equilibrium mixture is -80.2°.