Chirality in chemistry

Chirality in chemistry - Test

1. What does it mean for a molecule to be chiral?

A) It cannot be superimposed on its mirror image.
B) It has no optical rotation.
C) It has no stereocenters.
D) It has a linear structure.

2. What is a stereocenter?

A) An atom that is bonded to four identical groups.
B) An atom that is bonded to two groups.
C) An atom that is bonded to three different groups.
D) An atom that is bonded to four different groups.

3. How many stereoisomers can a chiral molecule with one stereocenter have?

A) 2
B) 3
C) 1
D) 4

4. Which type of light is used in optical rotation experiments?

A) Ultraviolet light.
B) Infrared light.
C) Visible light.
D) Plane-polarized light.

5. What is an optically active compound?

A) A compound that absorbs light.
B) A compound with high molecular weight.
C) A compound that rotates the plane of polarized light.
D) A compound with no stereocenters.

6. What is a racemic mixture?

A) A 50:50 mixture of two enantiomers.
B) A mixture of diastereomers.
C) A mixture of structurally different molecules.
D) A mixture of meso compounds.

7. Why are enantiomers important in drug development?

A) They have the same properties in the body.
B) They have no medicinal value.
C) They are easier to synthesize.
D) They can have different biological effects.

8. How does chirality affect the physical properties of a molecule?

A) Diastereomers have identical boiling points.
B) Racemic mixtures have higher melting points than pure enantiomers.
C) Chiral molecules are always more soluble than achiral molecules.
D) Enantiomers have identical physical properties except for optical activity.

9. How can chirality be determined experimentally?

A) By measuring optical activity with a polarimeter.
B) By checking the molecular weight of a compound.
C) By counting the number of carbons in a molecule.
D) By analyzing the color of the substance.

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