Chirality in chemistry

Chirality in chemistry - Test

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

A) It has no stereocenters.
B) It cannot be superimposed on its mirror image.
C) It has no optical rotation.
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 four different groups.
C) An atom that is bonded to two groups.
D) An atom that is bonded to three different groups.

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

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

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

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

5. What is an optically active compound?

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

6. What is a racemic mixture?

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

7. Why are enantiomers important in drug development?

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

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

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

9. How can chirality be determined experimentally?

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

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