Specific Rotation
Trending Questions
Q. Which of the following defines optical purity?
- Ratio of observed rotation to the rotation of pure enantiomer
- Ratio of rotation of pure enantiomer to the observed rotation
- Product of rotation of pure enantiomer and observed rotation
- None of the above
Q. The specific rotations of freshly prepared aqueous solutions of I and II are +112 and +18.7, respectively. On standing, the optical rotation of the aqueous solution of I slowly decreases to give a final value of +52.7 due to equilibration with II. Under this state of equilibrium, what is the ratio of concentration of II:I?
- 0.57
- 1.00
- 1.75
- 5.9
Q. 53. Determine the specific rotation of (-)-2-octanol obtained by the reaction of (+)-2-bromooctane (of specific rotation = +24.9^° ) with aqueus sodium hydroxide . Given specific rotation for optically pure (+)-2-bromooctane and (-)-2-octanol have specific rotations of +39.6^° and -10.3^° respectively
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:
The % optical purity of the compound is:
- 100%
- 33.3%
- 75%
- Cannot be predicted.
Q. If lengths of four samples of a compound are in order D>B>A>C (θ, c are same), the order of specific rotations is:
- A
- B
- C
- D