Understanding Isomeric Relationships

What is the first step in determining the relationship between two molecular structures?

• See if they are drawn on the same page

• Determine if they have the same formula

• Count the number of atoms

• Check if they have the same color

When two molecules have the same formula but different bond connectivity, what are they called?

• Identical compounds

• Diastereomers

• Enantiomers

• Constitutional isomers

What is a key characteristic of enantiomers?

• They have no chiral centers

• They are always identical

• They have the same color

• They are mirror images of each other

What must be true for a compound and its mirror image to be enantiomers?

• The compound must be a liquid

• The compound must be a gas

• The compound must be chiral

• The compound must be achiral

What distinguishes diastereomers from enantiomers?

• They have no chiral centers

• They are mirror images

• They have different physical properties

• They are identical

How can you identify a meso compound?

• It is always a gas

• It has no chiral centers

• It is always a liquid

• It has an internal mirror plane

What is a benefit of using Fischer projections in stereochemistry?

• They make molecules colorful

• They are only used for liquids

• They simplify the assignment of R and S configurations

• They are only used for gases

In Fischer projections, what does swapping two groups on a chiral center do?

• Makes the molecule a liquid

• Changes the color of the molecule

• Inverts the configuration

• Makes the molecule a gas

What is the relationship between two molecules with one chiral center in the same configuration and one in the opposite?

• They are constitutional isomers

• They are identical

• They are enantiomers

• They are diastereomers

What is the significance of a sigma plane in a molecule?

• It indicates the molecule is chiral

• It indicates the molecule is a gas

• It indicates the molecule is achiral

• It indicates the molecule is a liquid