Chirality and Isomerism Concepts

What is a chiral molecule?

• A chiral molecule contains no asymmetric carbon atoms.

• A chiral molecule has identical mirror images.

• A chiral molecule is one that can be superimposed on its mirror image.

• A chiral molecule is one that has a non-superimposable mirror image.

Define an achiral molecule.

• An achiral molecule is always a complex molecule.

• An achiral molecule is superimposable on its mirror image.

• An achiral molecule cannot be superimposed on its mirror image.

• An achiral molecule has no symmetry elements.

What are enantiomers and how do they relate to chirality?

• Enantiomers are non-superimposable mirror images of chiral molecules.

• Enantiomers are a type of isomer that are always superimposable.

• Chirality refers to molecules that have no optical activity.

• Enantiomers are identical molecules that can be superimposed.

Explain the difference between diastereomers and enantiomers.

• Both diastereomers and enantiomers are mirror images.

• Diastereomers are not mirror images; enantiomers are mirror images.

• Diastereomers are identical; enantiomers are different.

• Diastereomers have the same physical properties; enantiomers have different properties.

What structural feature is necessary for a molecule to be chiral?

• A nitrogen atom bonded to four different substituents.

• A carbon atom bonded to four different substituents.

• A carbon atom bonded to three hydrogen atoms and one chlorine atom.

• A carbon atom bonded to two identical groups and one hydrogen atom.

Can a molecule be both chiral and achiral? Explain your answer.

• A molecule can be chiral if it has a plane of symmetry.

• A molecule can be chiral in one form and achiral in another.

• No, a molecule cannot be both chiral and achiral.

• Chiral and achiral are interchangeable terms in chemistry.

What property can be assigned to a carbon atom that has four different atoms or structural groups attached to it?

• isomerity

• chirality

• chivalry

• geometry

How many chiral center is found in C₂H₅CH(OH)CH₂OH?

• 1
• 2
• 3
• 4

The two Geometric isomers shown are called:

• Cis/trans 1,2 dichloroethane

• Cis/trans 1,2 dichloroethene

• Cis/trans 1,2 chloroethane

• Cis/trans 1,2 chloroethene

Which of the following compounds is the enantiomer of the above compound?

• 
• 
• 
• All of them.