Answer:
The correct answer is May be alpha or beta.
Explanation:
Alpha D glucose and Beta D glucose structural configuration based the position of -OH group of C1 carbon or anomeric carbon.
if the C1 OH and C6 CH2OH are present in the same plane of the ring then the glucose molecule will exist in beta configuration.
On the other hand if C1 OH and C6 CH2OH are present in the opposite side of ring with respect to each other then the glucose molecule will exist in alpha configuration.
The position of -OH group of C4 atom above or down the plane does not matter for the structural appearance of glucose in alpha or beta configuration.
From that point of view it can be said that according to the question the glucose molecule will exist either in alpha or beta configuration.
