Chirality MCQs Engineering Chemistry (PPSC)

1. What are the Chiral molecules?

(A) Unstable molecules

(B) Not superimposable on their mirror images

(C) Shows geometrical isomerism

(D) Superimposable on their mirror images

2. For any given substance, the amount of rotation does not depend upon which of the following?

(A) Temperature

(B) Pressure

(C) Nature of the solvent

(D) Wavelength of light used

3. Not an example of chiral object is

(A) Cylindrical helix

(B) Sandal or shoe

(C) Square box

(D) Glove

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

5. 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) +400

(C) +100

(D) 100

6. Which of the following are the Chiral molecules that are non-superimposable mirror images of each other?

(A) Meso compounds

(B) Enantiomers

(C) Racemic mixture

(D) Diastereomers

7. 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

8. To avoid the excessive high value of molecular rotation, what do we take the concentration?

(A) 1 mole/mL

(B) 1 kilo-mole/mL

(C) 1 milli-mole/mL

(D) 1 centi-mole/mL

9. The Enantiomerism is the phenomenon of existence of enantiomers in a single structural formula, in which of the following configuration?

(A) Same

(B) Same as well as opposite

(C) Opposite

(D) Initially opposite and then same

10. 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) Axis of symmetry

(C) Plane of symmetry

(D) Angle of symmetry

11. 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

12. The incorrect statement from the following is

(A) The chemical properties of enantiomers are always identical in the symmetrical environment

(B) The enantiomers have always different solubilities in the same chiral solvent

(C) The physical properties of enantiomers are always identical in the symmetrical environment

(D) The enantiomers always react at the same rate and form products in the same amount in an asymmetrical environment

13. Which of the following are the Diastereomers?

(A) Mirror images

(B) Unstable molecules

(C) Geometrical isomers

(D) Non-mirror images

14. A plane of symmetry is equivalent to which of the following fold alternating axis of symmetry?

(A) Three

(B) One

(C) Four

(D) Two

15. A centre of symmetry is equivalent to which of the following fold alternating axis of symmetry?

(A) Two

(B) Three

(C) One

(D) Four