A compound is having an observed rotation of +8.4. The rotation for the pure enantiomer is calculated as +12. The composition of mixture in terms of dextrorotatory $\left(d\right)$ and levorotatory $\left(l\right)$ is:

Q. A compound is having an observed rotation of +10.5. The rotation for the pure enantiomer is calculated as +14.
The % optical purity of the compound is:

Q. 2-Butanol having an observed rotation of +9.72 has the rotation for the pure enantiomer calculated as +13.5
Then choose the correct option(s):

Q. The enantiomeric excess of a mixture of 2-bromobutane with an observed specific rotation of $+{18.5}^{\circ }$. The specific rotation of (R)-2-bromobutane is $-{23.1}^{\circ }$ and (S)-2-bromobutane is $+{23.1}^{\circ }$.
How many percent of each enantiomer is present in the mixture?

Q. Sucrose is dextrorotatory but the mixture obtained after hydrolysis is levorotatory. Explain.

Q. Calculate the enantiomeric excess of a mixture of 2-bomobutane with an observed specific rotation of $+{18.5}^{\circ }$. The specific rotation of (R)-2-bomobutane is $-{23.1}^{\circ }$ and (S)-2-bomobutane is $+{23.1}^{\circ }$.