Question

Which of the statements concerning the equilibrium shown is true?

• A. The two structures are enatiomers of each other. They have equal but opposite optical rotations and recemize slowly at room temperature.
• B. The two structures are enatiomers of each other. They recemize too rapidly at room temperature for their optical rotations to be measured.
• C. The two structures are diastereomers of each other. Their interconversion is called mutarotation.
• D. The two structures are diastereomers of each other. Their interconversion does not require breaking and making bonds, only a change in conformation.

Answer 1

The correct option is C The two structures are diastereomers of each other. Their interconversion is called mutarotation.

A is not super imporable on $B$ but both $A$ & $B$ have some formula and are optically active

Thus $A$ & $B$ are diastercomers

Mutarotation is change in the optical rotation because of change in the equilibrium between two anomess when corresponding stereocenters convert

in the above mutarotation is shown because $\alpha$ & $\beta$ anomers interconvert