Chirality MCQs Engineering Chemistry (PPSC)

By: Prof. Dr. Fazal Rehman | Last updated: November 23, 2024

1. What are the Chiral molecules?
(A). Unstable molecules
(B). Superimposable on their mirror images
(C). Shows geometrical isomerism
(D). Not superimposable on their mirror images
(E). None of these
Multiple Choice Question Answer: D

2. For any given substance, the amount of rotation does not depend upon which of the following?
(A). Temperature
(B). Nature of the solvent
(C). Pressure
(D). Wavelength of light used
(E). None of these
Multiple Choice Question Answer: C

3. Not an example of chiral object is _________
(A). Cylindrical helix
(B). Sandal or shoe
(C). Glove
(D). Square box
(E). None of these
Multiple Choice Question Answer: D

4. The specific rotation is inversely proportional to which of the following?
(A). Temperature
(B). Concentration of solution
(C). Observed rotation
(D). D-line of sodium vapour light
(E). None of these
Multiple Choice Question Answer: B

5. If rotation of the plane is clockwise, then the substance is always dextrorotatory.
(A). True
(B). False
(E). None of these
Multiple Choice Question Answer: A

6. If 0.5 g of an optically active compound was dissolved in 2 mL of solvent at 25°C and the solution was kept in a cell of length 10 cm and observed rotation was +100, then the specific rotation of its enantiomer will be ___________
(A). -400
(B). -100
(C). +100
(D). +400
(E). None of these
Multiple Choice Question Answer: D

7. Which of the following are the Chiral molecules that are non-superimposable mirror images of each other?
(A). Meso compounds
(B). Racemic mixture
(C). Enantiomers
(D). Diastereomers
(E). None of these
Multiple Choice Question Answer: C

8. The correct statement from the following is that the Enantiomer rotate plane of polarized light in _________
(A). Opposite direction but to the same extent
(B). Opposite direction and to a different extent
(C). Same direction and to the same extent
(D). Same direction but to a different extent
(E). None of these
Multiple Choice Question Answer: A

9. To avoid the excessive high value of molecular rotation, what do we take the concentration?
(A). 1 mole/mL
(B). 1 centi-mole/mL
(C). 1 milli-mole/mL
(D). 1 kilo-mole/mL
(E). None of these
Multiple Choice Question Answer: B

10. The Enantiomerism is the phenomenon of existence of enantiomers in a single structural formula, in which of the following configuration?
(A). Same
(B). Opposite
(C). Same as well as opposite
(D). Initially opposite and then same
(E). None of these
Multiple Choice Question Answer: B

11. The Optical activity results from the lack of molecular symmetry in the molecules.
(A). True
(B). False
(E). None of these
Multiple Choice Question Answer: A

12. Which of the following is the plane that divides the molecule into two equal parts so that each half is the mirror image of the other half?
(A). Centre of symmetry
(B). Plane of symmetry
(C). Axis of symmetry
(D). Angle of symmetry
(E). None of these
Multiple Choice Question Answer: B

13. When a molecule has a plane of symmetry, what will this be?
(A). Optically inactive
(B). Optically active
(C). Both optically active & inactive
(D). Enantiomer
(E). None of these
Multiple Choice Question Answer: A

14. The incorrect statement from the following is __________
(A). The chemical properties of enantiomers are always identical in the symmetrical environment
(B). The enantiomers always react at the same rate and form products in the same amount in an asymmetrical environment
(C). The physical properties of enantiomers are always identical in the symmetrical environment
(D). The enantiomers have always different solubilities in the same chiral solvent
(E). None of these
Multiple Choice Question Answer: B

15. Which of the following are the Diastereomers?
(A). Mirror images
(B). Non-mirror images
(C). Geometrical isomers
(D). Unstable molecules
(E). None of these
Multiple Choice Question Answer: B

16. A plane of symmetry is equivalent to which of the following fold alternating axis of symmetry?
(A). Three
(B). Two
(C). Four
(D). One
(E). None of these
Multiple Choice Question Answer: D

17. A centre of symmetry is equivalent to which of the following fold alternating axis of symmetry?
(A). Two
(B). Three
(C). One
(D). Four
(E). None of these
Multiple Choice Question Answer: A

18. As the optical activity changes with the wavelength of the light, we should never use the monochromatic light for measuring the optical activity.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: A

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