Chirality in chemistry

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

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

2. What is a stereocenter?

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

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

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

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

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

5. What is an optically active compound?

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

6. What is a racemic mixture?

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

7. Why are enantiomers important in drug development?

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

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) Diastereomers have identical boiling points.
D) Racemic mixtures have higher melting points than pure enantiomers.

9. How can chirality be determined experimentally?

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

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