Galactose is a simple sugar formed when lactose, a carbohydrate in milk, is hydrolyzed. In...

Galactose is a simple sugar formed when lactose, a carbohydrate in milk, is hydrolyzed. Individuals with galactosemia, a rare inherited disorder, lack an enzyme needed to metabolize galactose, and must avoid cow’s milk and all products derived from cow’s milk. Galactose is a stereoisomer of glucose (Problem 4.63).

a.       draw both chair forms of galactose and label the stable conformation.

b.      Which simple sugar, galactose, is more stable? Explain.

c.       Draw a constitutional isomer of galactose.

d.       Draw a stereoisomer  of galactose that is different  from gulcose.