Explore topic-wise MCQs in Organic Chemistry.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry 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
Discussion
2.

What can be said with certainty if a compound has = -9.25 ?

A. The compound has the (S) configuration
B. The compound has the (R) configuration
C. The compound is not a meso form
D. The compound possesses only one stereogenic center
Answer» D. The compound possesses only one stereogenic center
Discussion
3.

What is the percent composition of a mixture of (S)-(+)-2-butanol, = +13.52 , and (R)-(-)-2-butanol, = -13.52 , with a specific rotation = +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)
Discussion
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
Discussion
5.

What is the effect of the I on the specific optical rotation ( ), if I gets double?

A. gets double
B. gets halved
C. gets four times
D. eight times
Answer» B. gets halved
Discussion
6.

A solution of 0.1 g/mL of a pure R enantiomer in a 1.0 dm (i.e., 10 cm) polarimeter rotates plane polarized light by +4.8 . What is the rotation observed on this solution in a 2 dm polarimeter?

A. +2.4
B. +4.8
C. +19
D. +9.6
Answer» E.
Discussion