Explore topic-wise MCQs in Organic Chemistry Questions and Answers.

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