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This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
1. |
What is the specific optical rotation of (S)-malic acid at a concentration of 5.5 g/ mL in the solvent pyridine at 20°C at a wavelength of 589 nm? |
A. | the specific rotation is –27° |
B. | the specific rotation is +27° |
C. | the specific rotation is –17° |
D. | the specific rotation is +17° |
Answer» B. the specific rotation is +27° | |
2. |
Which of these is a comparatively insignificant factor affecting the magnitude of specific optical rotation? |
A. | Concentration of the substance of interest |
B. | Purity of the sample |
C. | Temperature of the measurement |
D. | Length of the sample tube |
Answer» D. Length of the sample tube | |
3. |
What is the percent composition of a mixture of (S)-(+)-2-butanol, α= +13.52°, and (R)-(-)-2-butanol, α = -13.52°, with a specific rotation α = +6.76°? |
A. | 75%(R) 25%(S) |
B. | 25%(R) 75%(S) |
C. | 50%(R) 50%(S) |
D. | 67%(R) 33%(S) |
Answer» C. 50%(R) 50%(S) | |
4. |
If a solution of a compound (30.0 g/100 mL of solution) has a measured rotation of +15° in a 2 dm tube, what is the specific rotation? |
A. | +50° |
B. | +25° |
C. | +15° |
D. | +7.5° |
Answer» C. +15° | |
5. |
What is the effect of the I on the specific optical rotation (α), if I gets double? |
A. | α gets double |
B. | α gets halved |
C. | α gets four times |
D. | α eight times |
Answer» B. α gets halved | |