Mutarotation

Q. The optical rotation of the $\alpha$- form of a pyranose is $+{150.7}^{\circ }$, that of the $\beta$-form is $+{52.8}^{\circ }$. In solution an equilibrium mixture of these anomers has an optical rotation of $+{80.2}^{\circ }$. The percentage of the $\alpha$- form in equilibrium mixture is:

1. 28%
2. 32%
3. 68%
4. 72%

Q.
The product A and B in the above reaction are

1. Diastereomers
2. C-2 epimers
3. Anomers
4. Both A and B

Q. AlCl_{3 }forms a dimer but FeCl_3 does not .Why ?

Q.

Which one is a disaccharide ?

1. Glucose

2. Fructose

3. Xylose

4. Sucrose